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ID Date Author Status Type Category Location Title Text   245   Wed Sep 10 11:27:45 2025 Alice Renaux Under Process report lasers and optics Optical room new cavity The 2-mirrors cavity has 460ppm of transmission for M1 and 10ppm for M2 which should exhibit a Finesse around 13400.      244   Tue Sep 9 21:23:11 2025 Alice Renaux Under Process report lasers and optics Optical room new cavity Yesterday, we changed the M1 mirror to a 161185 Gamma Factory mirror of transmission 460ppm, the      243   Thu Sep 4 17:56:50 2025 Alice Renaux Under Process report lasers and optics Optical room Finesse measurement (Finesse 2651 is consistent with that obtained from the mirrors' transmission coefficients, which is about 3100.)      242   Thu Sep 4 17:52:03 2025 Alice Renaux Under Process report lasers and optics Optical room Finesse measurement Today, with Ronic, we measured the finesse of the 2-mirror cavity witht the NKT CW laser. We were able to perfrom the measurement      241   Thu Sep 4 17:35:50 2025 Ronic Chiche Fixed info lasers and optics | detectors and electronics Optical room Installation of the avalanche photodiode After installing the 2nd EOM, we had some trouble to be able to lock again. One possible reason was the very low      240   Wed Sep 3 18:10:34 2025 Alice Renaux Under Process report lasers and optics Optical room Successful lock (finally !) Today, with Ronic, we managed to get a successful lock with the NKT laser by setting up a new PDH box from scratch (photodiode      239   Thu Aug 28 15:29:00 2025 Alice Renaux Under Process report lasers and optics Optical room 2-mirror cavity locking In June, we encountered some problems regarding the transmission and error signals (see images here),      238   Mon Jun 23 14:38:33 2025 Ronic Chiche Under Process issue mechanics | lasers and optics | detectors and electronics Optical room first attempt to lock With Alice, we installed the EOWaves oscillator to be locked on the FP-cavity (T1 ~ 2500ppm, T2 ~ 10ppm => F ~ 2500)      237   Fri Jun 13 20:10:00 2025 Alice Renaux Fixed report lasers and optics Optical room Damaged mirrors test Today with Dorian we tested three mirrors with which we previously haven't been able to obtain any resonance or optical beating      236   Wed May 28 18:27:27 2025 Alice Renaux Under Process report lasers and optics Optical room 2-mirror cavity full setup Today with Ronic, we changed the FP cavity's mirrors to Layertek (Gamma Factory) mirrors :      235   Wed May 28 10:55:15 2025 Alice Renaux Under Process report lasers and optics Optical room 2-mirror cavity alignment The NKT laser PZT sensitivity is ~0.09pm/V of wavelength variation, which is equivalent to ~ 25MHz/V      234   Tue May 27 18:12:22 2025 Alice Renaux Under Process report lasers and optics Optical room 2-mirror cavity alignment Yesterday and today, I replaced the OEWaves CW laser with the NKT CW laser. Its screen does not display anything, so it has to be      233   Fri Mar 21 18:27:36 2025 Alice Renaux Under Process report mechanics | lasers and optics Optical room 2-mirror cavity alignment At the beginning of the week, I installed a half-wave plate, a beamsplitter cube and a quarter-wave plate, as well as the end-of-cavity      232   Tue Mar 4 18:51:57 2025 Ronic Chiche Under Process info mechanics | lasers and optics Optical room Alignment of a 2-mirror FP cavity today with Alice, - we measured the height of the SBOX windows center : 140mm from the optical      231   Tue Mar 4 18:33:26 2025 Ronic Chiche Fixed info utilities Optical room optical table cleaning now, it seems the table is clean enough (dust meter counts 0 particles) to install a 2 mirrors FP-cavity.      230   Mon Dec 16 10:20:56 2024 Ronic Chiche Under Process issue lasers and optics Optical room CELIA 100W laser amplifier repair friday morning, we add a zoom call with Jerome Lhermite about the amplifier repair. he approximately confirmed the amplifier      229   Fri Dec 6 16:59:57 2024 Ronic Chiche Fixed info utilities Optical room optical table cleaning this afternoon, we checked the dust meter which is at 0 for 1 and 5µm dust particles but ~ 2000-3000 for 0.3µm particles.      228   Tue Dec 3 13:51:52 2024 Ronic Chiche Fixed info utilities Optical room optical table cleaning this morning with Alice and Daniele, we removed all the optics elements and equipments from the SBOX optical table and started to      227   Fri Nov 29 16:50:04 2024 Alice Renaux Under Process info lasers and optics Optical room Menhir 216MHz laser The Menhir 216MHz laser has been put back in place on the cavity table. Its output power is measured to be 160mW with an attenuator.      226   Fri Nov 29 12:06:05 2024 Alice Renaux Fixed info lasers and optics Optical room Menhir 160MHz laser The Menhir 160MHz has been put back in place on the CELIA amplifier setup. Its output power is measured to be 150-160mW with an      225   Wed Oct 2 18:12:54 2024 Ronic Chiche Under Process issue lasers and optics Optical room CELIA 100W laser amplifier repair this afternoon, we saw some electric cables badly connected to their power supply. we fixed it by soldering them together      224   Wed Oct 2 10:12:55 2024 Ronic Chiche Under Process issue lasers and optics Optical room CELIA 100W laser amplifier repair this morning with Alice, we sent the Menhir 160MHz injected in a fiber (with 6mW at the end of a long fiber) into the laser amplifier,      223   Wed Jun 19 10:38:00 2024 Ronic Chiche Fixed info mechanics | lasers and optics | detectors and electronics Optical room D-shape mirrors positionning status summary: - the motors used to move the D-shape are the Newport Picomotors 8303-V      222   Fri May 17 15:02:01 2024 Xinyi Lu Fixed info lasers and optics Optical room high-power experiments of 2-mirror cavity Here's a summary of our experiment last week: The initial telescope position:  6x    221   Thu May 16 18:51:17 2024 Xinyi Lu Fixed info lasers and optics Optical room high-power experiments of 2-mirror cavity here is a Matlab code to try to optimize the telescope for a hot cavity, taking into account the thermal lens      220   Mon May 6 18:38:18 2024 Xinyi Lu Fixed info lasers and optics Optical room high-power experiments of 2-mirror cavity Today, Ronic, Daniele and I redo the high-power 2-mirror cavity experiments, and the results are shown in the table (Figure 1 and      219   Thu Apr 25 22:12:25 2024 Xinyi Lu Fixed info lasers and optics Optical room 2 mirror cavity high power experiments Today, Ronic and I recorded some intracavity power and cavity mode size as shown in Fig. 1.      218   Tue Apr 16 18:38:04 2024 Xinyi Lu Fixed info lasers and optics Optical room Fiber injection, spectrum and connection of 2nd stage amplifier Today, Daniele and I injected the laser into the fiber, installed the telescope, connected the second stage of the amplifier,      217   Mon Apr 15 18:19:40 2024 Xinyi Lu Fixed info lasers and optics Optical room Finesse measurement of 2-mirror cavity - Today Daniele and I cleaned the spherical mirror by wiping it with alcohol, and the finesse increased to 47k      216   Fri Apr 12 17:18:15 2024 Xinyi Lu Fixed info lasers and optics Optical room Install 2-mirror cavity Today Viktor and I completed the installation of the two-mirror cavity and managed to lock and measure the finesse.      215   Thu Apr 11 19:09:21 2024 Xinyi Lu Fixed info lasers and optics Optical room Install 2-mirror cavity Today, Viktor and I started installing the two-mirror cavity. - Firstly, we cleaned the environment      214   Wed Apr 10 11:35:54 2024 Xinyi Lu Fixed info lasers and optics Optical room Finesse measurement (35k) These days, Ronic, Aurélien and I use OEwaves CW laser to measure the finesse of SBOX. We made 5 measurements      213   Tue Apr 9 08:57:22 2024 Xinyi Lu Fixed info lasers and optics Optical room Different cavity modes & Pulse width Additional information: The pulse duration has been performed in RF on a UPD-70-IR2-P photodiode from Alphalas      212   Mon Apr 8 08:34:54 2024 Xinyi Lu Fixed info lasers and optics Optical room Different cavity modes & Pulse width - Last week, we obtained three curves of the variation of different cavity modes with power (Fig. 1). By comparing the gain for      211   Thu Apr 4 21:48:16 2024 Xinyi Lu Fixed info lasers and optics Optical room Larger beam size & Spectrum - We re-measured the gain before moving the mirror. Gain ~9000 was achieved at 3A, but as the power increased, the gain dropped      210   Wed Apr 3 21:37:07 2024 Xinyi Lu Fixed info lasers and optics Optical room High power experiments (550kW) - Today we moved the position of the D-shaped mirror at 6A. When motor1 (vertical) is 0.2mm away from the spot, the power in the cavity      209   Wed Apr 3 08:53:33 2024 Xinyi Lu Fixed info lasers and optics Optical room High power experiments (520kW) Yesterday, Ronic, Xing, Qili and I achieved a more stable 520kW power at 7.5A (71W injection) by optimizing the alignment and locking parameters.      208   Tue Apr 2 08:39:17 2024 Xinyi Lu Fixed info lasers and optics Optical room High power experiments (500kW) Last week, we achieved a stable intracavity average power of 500kW, limited by amplifier power. The experimental data are shown      207   Fri Mar 29 16:23:34 2024 Ronic Chiche Fixed info lasers and optics | detectors and electronics Optical room 100W CELIA laser amplifier "Power vs Pump current" curve We measured again the 100W CELIA laser amplifier with a pump current until 8A. as the first current pump of the      206   Thu Mar 28 19:03:55 2024 Xinyi Lu Fixed info lasers and optics Optical room Amplifier power and mirror transmission Today, Ronic, Daniele, Aurélien and I measured the amplifier power and mirror transmission.      205   Wed Mar 27 22:37:02 2024 Xinyi Lu Fixed info lasers and optics Optical room High power experiments (272kW) Today, Ronic and I achieved 272kW inside the cavity at 7.5A. The coupling maintained 60%-70%.      204   Wed Mar 27 09:47:37 2024 Xinyi Lu Fixed info lasers and optics Optical room High power experiments (200kW) all the injection power in the chart have not been measured recently but during the Loic thesis period.      203   Tue Mar 26 19:36:48 2024 Xinyi Lu Fixed info lasers and optics Optical room High power experiments (200kW) These days, Ronic and I achieved 200kW inside the cavity and 70% coupling efficiency. - By optimizing the telescope,      202   Thu Mar 21 17:32:59 2024 Xinyi Lu Fixed info lasers and optics Optical room Polarization issue & 50kW with 22W injection Today, Ronic and I lock the cavity on the other polarization and achieved 50kW with 22W injection.      201   Thu Mar 21 09:26:50 2024 Xinyi Lu Fixed info lasers and optics Optical room Polarization issue just to add some details : about the S and P polarization      200   Wed Mar 20 18:22:53 2024 Xinyi Lu Fixed info lasers and optics Optical room Polarization issue These days, Ronic, Aurélien, Fatematuj and I have been doing some tests on polarization issue, trying to see if it is possible to      199   Wed Mar 13 19:44:41 2024 Xinyi Lu Fixed info lasers and optics Optical room Injection at the amplifier current of 2 A Today, Ronic and I optimized the locking at the amplifier current of 2 A and obtained ~ 21 kW inside      198   Tue Mar 12 22:13:47 2024 Xinyi Lu Fixed info lasers and optics Optical room Coupling efficiency improvement - Today, Ronic and I locked at the amplifier current of 2 A and obtained ~60% coupling after optimizing the CEP (see Figure      197   Fri Mar 8 18:04:43 2024 Xinyi Lu Fixed info lasers and optics Optical room Coupling efficiency improvement Today, Ronic and I installed the new telescope and locked the cavity. - We locked at the amplifier      196   Thu Mar 7 18:55:42 2024 Xinyi Lu Fixed info lasers and optics Optical room Coupling efficiency improvement - These days, Ronic, Fatematuj and I measured the beam parameters of the output of the third-stage amplifier.      195   Wed Feb 28 17:26:46 2024 Ronic Chiche Fixed info lasers and optics | software Optical room 100W CELIA laser amplifier "how's to" document 1st version of the document. if some information is not correct or missing, give any comment by replying      194   Tue Feb 27 17:51:56 2024 Xinyi Lu Fixed info lasers and optics Optical room Amplified laser injection In the last two days, Ronic and I connected the amplifier and locked the cavity. - We installed an iris on the output      193   Mon Feb 26 16:53:24 2024 Xinyi Lu Fixed info lasers and optics Optical room Menhir pulsed laser locking here is the code to get this last curve      192   Mon Feb 26 08:58:33 2024 Xinyi Lu Fixed info lasers and optics Optical room Menhir pulsed laser locking Last week, Ronic and I focused on CEP measurements of the menhir laser. Measurements without      191   Wed Feb 21 18:09:11 2024 Xinyi Lu Fixed info lasers and optics Optical room Menhir pulsed laser locking Here is a simulation of the relative FP-cavity gain vs the CEP for a Finesse of 23000 and taking into account the Menhir laser optical      190   Wed Feb 21 17:33:59 2024 Xinyi Lu Fixed info lasers and optics Optical room Menhir pulsed laser locking These days, Ronic, Daniele and I achieved stable cavity locking with the menhir pulsed laser.      189   Wed Feb 14 17:20:26 2024 Xinyi Lu Fixed info lasers and optics Optical room Cleaning of Mirrors - Today, Daniele and I cleaned the cavity inside, recleaned the M2 and M4 and their mounts, optimized the locking,      188   Tue Feb 13 17:33:28 2024 Xinyi Lu Fixed info lasers and optics Optical room Cleaning of Mirrors Today, Daniele and I cleaned mirrors one by one using pure water, alcohol, and the spin coater. Here are the measurements of      187   Mon Feb 12 17:17:04 2024 Xinyi Lu Fixed info lasers and optics Optical room Cleaning of Mirrors - Today we cleaned the environment and put the spin coater and microscope inside the airflow.      186   Fri Jan 26 17:33:05 2024 Xinyi Lu Fixed info lasers and optics Optical room Cleaning of Mirrors Today Daniele, Ronic and I cleaned the mirrors and locked the cavity. However, the finesse was only 13,000 because of the not      185   Wed Jan 24 20:33:27 2024 Xinyi Lu Fixed info lasers and optics Optical room Install new mirrors Yesterday we checked the mirrors with UV light and there was some dust on the mirrors, especially M2.      184   Mon Jan 22 18:18:01 2024 Xinyi Lu Fixed info lasers and optics Optical room Install new mirrors - Today, Ronic and I changed the signal generator to a low-noise one (with a delay time of only 0.5 us). Then we moved      183   Thu Jan 18 22:14:03 2024 Xinyi Lu Fixed info lasers and optics Optical room Install new mirrors - In the last two days, Ronic and I installed new mirrors after cleaning the environment, and locked the cavity.      182   Wed Jan 17 21:11:59 2024 Xinyi Lu Fixed info lasers and optics Optical room Install new mirrors Today, Ronic and I installed the new mirrors and got resonance. We can see the oscillations in this high-finesse case. We haven't      181   Tue Jan 16 18:42:42 2024 Xinyi Lu Fixed info lasers and optics Optical room FSR and Finesse measurement - Today, Ronic and I measured the finesse and FSR after optimizing the locking. FSR was adjusted to 160.27 MHz to match the pulsed      180   Mon Jan 15 19:19:00 2024 Xinyi Lu Fixed info lasers and optics Optical room Coupling efficiency improvement - We got 30% coupling efficiency by installing a set of telescopes, adjusting the polarization and optimizing the alignment. The diameter      179   Wed Jan 10 18:35:46 2024 Xinyi Lu Fixed info lasers and optics Optical room Coupling efficiency improvement - Recently we have focused on improving the coupling efficiency. Without the telescope, the original coupling efficiency was less      178   Wed Dec 20 10:45:37 2023 Xinyi Lu Fixed report lasers and optics Optical room Mounts installation and cavity alignment - Over the last few days, Viktor, Ronic and I have reinstalled the mounts and realigned the cavity with CW laser and old mirrors.      177   Thu Dec 14 17:52:53 2023 Xinyi Lu Fixed report lasers and optics Optical room Mounts installation and cavity alignment Over the past few days, Viktor, Ronic and I have continued to align the cavity. We installed 4 mirrors and monitored the      176   Fri Dec 8 18:59:24 2023 Xinyi Lu Fixed report lasers and optics Optical room Mounts installation and cavity alignment Over the last two days, Viktor, Ronic and I have started to install the mirror mounts and try to align the cavity.      175   Thu Dec 7 09:30:03 2023 Ronic Chiche Fixed info mechanics | lasers and optics | detectors and electronics | software Optical room new setup for the 160MHz Menhir oscillator from the begining of the week, Xinyi, Aurélien, Viktor and myself started to install a new setup for the Menhir 160MHz oscillator.      174   Thu Dec 7 09:09:27 2023 Ronic Chiche Fixed info lasers and optics ThomX igloo New mirrors batch informations the 2 files describe the specfications for the 16 mirrors ordered (4 for ThomX + spare, 4 for SBOX + spare) and the measurements      173   Fri Jan 6 12:33:18 2023 Ronic Chiche Fixed info lasers and optics Optical room Laser Menhir reinstallation + CVBG + fiber injection The lab purchased the Menhir laser @ 216MHz. it has been sent back to Menhir photonics for inspection, and then is now      172   Wed Sep 28 18:43:51 2022 Manar Amer Fixed report lasers and optics Optical room M2 ThomX spherical Cleaning Today, M2 Spherical-3 from ThomX that was installed inside the SBox was removed, there was one big dust on the surface of the mirror,  6x    171   Tue Sep 27 19:30:49 2022 Manar Amer Fixed report lasers and optics Optical room M1 Gamma Factory In the morning, Vacuum broken and rotated M1 ThomX 90 degrees clockwise, locked the cavity in air and we observe a degeneracy      170   Mon Sep 26 16:15:06 2022 Manar Amer Fixed report lasers and optics Optical room M1 ThomX used while shifted from damaged spot On Wednesday 21st , I opened the cavity did an additional 2 mm shift of the injection mirror and put it under vacuum again.      169   Wed Sep 21 12:10:07 2022 Manar Amer Fixed report lasers and optics Optical room M1 ThomX used while shifted from damaged spot To compare between the 2 images of the cavity mode: the mode by itself has      168   Tue Sep 20 12:50:40 2022 Manar Amer Fixed report lasers and optics Optical room M1 ThomX used while shifted from damaged spot Yesterday , we locked the cavity and we see a sign of a high finesse on the transmission signal, but no measurement of Finesse was      167   Fri Sep 16 17:47:56 2022 Manar Amer Fixed report lasers and optics Optical room Damage on mirror surface ThomX injection mirror has been cleaned and placed again inside the optical cavity. This time to avoid the damaged      166   Fri Sep 16 15:56:45 2022 Manar Amer Fixed report lasers and optics Optical room Damage on mirror surface a better image of the damaged spot, image taken with the arrow for the reflective surface facing the other direction (image shows position)      165   Wed Sep 14 17:21:59 2022 Manar Amer Fixed report lasers and optics Optical room Power storage In Cavity We improved the lock using the alignment, polarization and CEP , the maximum we got was ~ 12% coupling      164   Wed Sep 14 16:16:08 2022 Manar Amer Fixed report lasers and optics Optical room Power storage In Cavity The cavity was locked under vacuum, coupling is approximately < 10% The lock was relatively easy and      163   Tue Sep 13 19:31:14 2022 Manar Amer Fixed report lasers and optics Optical room liPower storage In Cavity After changing the mirror M1 and cleaning the 2 mirrors They were placed in the cavity      162   Tue Sep 13 19:26:27 2022 Manar Amer Fixed report lasers and optics Optical room Damage on mirror surface After discussing, we have decided against shifting the mirror to avoid the time lost. We changed the injection mirror      161   Mon Sep 12 18:50:57 2022 Manar Amer Fixed issue lasers and optics Optical room Damage on mirror surface Tomorrow will try to shift the injection mirror to avoid hitting the damaged spot.        160   Mon Sep 12 18:49:42 2022 Manar Amer Fixed issue lasers and optics Optical room Damage on mirror surface Following the storage of ~ 50 kW inside the cavity and a sudden drop in transmitted power from the cavity       159   Mon Sep 12 17:00:35 2022 Manar Amer Fixed report lasers and optics Optical room Power storage In Cavity at max stage we reached at 2.5 A on the diodes we have 8000 gain , coupling ~      158   Mon Sep 12 16:27:14 2022 Manar Amer Fixed report lasers and optics Optical room Power storage In Cavity Power increased in the amplifier reflective filters added at the transmission point to be able to have signal      157   Fri Sep 9 19:03:58 2022 Ronic Chiche Fixed info mechanics | lasers and optics | detectors and electronics Optical room D-shape mirrors positionning status The cavity box is vacuum pumped at 6*10^-2 mbar.      156   Fri Sep 9 18:35:07 2022 Ronic Chiche Fixed info mechanics | lasers and optics | detectors and electronics Optical room D-shape mirrors positionning status This afternoon we opened the cavity and put the D-shape mirrors at their correct place, close to the beam.      155   Fri Sep 9 15:47:46 2022 Manar Amer Fixed report lasers and optics Optical room Power storage In Cavity At transmission power of 42 mW, coupling 60%, we see fundamental mode with a degeneracy The D-shape motors were moved to      154   Fri Sep 9 14:44:35 2022 Manar Amer Fixed report lasers and optics Optical room Power storage In Cavity We start of power output from amplifier of 1W with only the first and second stage on then we start with the third stage power      153   Fri Sep 9 12:49:44 2022 Manar Amer Fixed report lasers and optics Optical room Locking Amplifier with Cavity Alignment was improved to ~ 1.2 V on the photodiode. Only the second stage was on with      152   Fri Sep 9 12:45:19 2022 Manar Amer Fixed report lasers and optics Optical room Locking Amplifier with Cavity image of the lock with Coupling of ~ 60%        151   Fri Sep 9 11:50:17 2022 Manar Amer Fixed report lasers and optics Optical room Locking Amplifier with Cavity We locked the cavity, and it is stable using the Transmission, the high frequency that we thought      150   Thu Sep 8 18:28:51 2022 Manar Amer Fixed report lasers and optics Optical room Locking Amplifier with Cavity We wanted to increase the power of the amplifier to measure the transmission output at M2,      149   Thu Sep 8 14:58:51 2022 Manar Amer Fixed report lasers and optics Optical room Locking Amplifier with Cavity We managed to lock the cavity by adding the AOM , but the lock is still difficult to stabilize.      148   Thu Sep 8 13:39:03 2022 Manar Amer Fixed report lasers and optics Optical room Locking Amplifier with Cavity We played on the CEP using the USB command "id0=xxxxx" of the Menhir. we put id0=48650 and we improved      147   Thu Sep 8 11:16:40 2022 Manar Amer Fixed report lasers and optics Optical room Locking Amplifier with Cavity Today, we played on the CEP but using the I-tune input of the Menhir Laser (+/- 5V maximal range).      146   Wed Sep 7 18:58:03 2022 Manar Amer Fixed report lasers and optics Optical room Locking Amplifier with Cavity Today we managed to observe the fundamental mode and stabilize the scan on it until we improved the alignment enough.      145   Wed Sep 7 18:57:20 2022 Manar Amer Fixed report lasers and optics Optical room Telescope / amplifier output We increased the power of the amplifier up to 10 W to see if there is a change in the beam shape at the injection point or      144   Tue Sep 6 17:47:40 2022 Ronic Chiche Fixed issue lasers and optics Optical room unsuccessful telescope design :-( we wanted to calculate the right telescope with 2 spherical lenses. 1) we have the FP cavity mode size      143   Mon Sep 5 18:06:53 2022 Manar Amer Fixed report lasers and optics Optical room Telescope / amplifier output Am adjustment on the lenses position to have a smaller waist. + 250 mm @ 88 cm from amplifier      142   Fri Sep 2 18:10:10 2022 Manar Amer Fixed report lasers and optics Optical room Telescope / amplifier output Note the correct beam divergence is approximately ~ 2.3 mrad      141   Fri Sep 2 17:50:21 2022 Manar Amer Fixed report lasers and optics Optical room Telescope / amplifier output removing the reading which is not correct (wrong use of software) redone a reading similar using      140   Wed Aug 31 18:14:51 2022 Ronic Chiche Fixed info lasers and optics Optical room 2nd stage CELIA amplifier today we did several test with the Dichroic shortpass mirror (Thorlabs DMSP1000) and with a 10nm optical filter around 1030nm      139   Tue Aug 30 17:48:39 2022 Ronic Chiche Fixed info lasers and optics Optical room 2nd stage CELIA amplifier today, we measured the 2nd stage CELIA amplifier pump wavelength : 970-990 nm      138   Wed Aug 24 10:45:24 2022 Manar Amer Fixed report lasers and optics Optical room 2 Mirror Setup @ 216.6 MHz Adding information about the 2 mirror cavity setup (plan - spherical) that is currently installed.      137   Wed Aug 24 10:39:58 2022 Manar Amer Fixed report lasers and optics Optical room Telescope / amplifier output Here is a view of beam propagation in the optical software : GaussianBeam the red filled shape is the model      136   Tue Aug 23 17:37:38 2022 Manar Amer Fixed report lasers and optics Optical room Telescope / amplifier output I placed a periscope to adjust the high of the beam from the amplifier output from ~ 10 cm from the table to ~ 15 cm      135   Mon Aug 22 18:39:13 2022 Manar Amer Fixed report lasers and optics Optical room Amplifier output Beam Profile Beam divergence after amplifier 4.46 mrad        134   Mon Aug 22 18:38:03 2022 Manar Amer Fixed report lasers and optics Optical room Telescope / amplifier output Beam divergence was measured using a method called  "Focal      133   Fri Aug 19 16:36:18 2022 Manar Amer Fixed report lasers and optics Optical room Telescope / amplifier output The previous Sbox telescope was dismantled and the mechanical components cleaned. its lenses are still in the mounts,      132   Fri Aug 19 16:31:11 2022 Manar Amer Fixed report lasers and optics Optical room Amplifier output Beam Profile In preparation to measure the output beam profile from the amplifier at high power, I have placed two wedge mirrors just before      131   Fri Aug 19 16:03:40 2022 Manar Amer Fixed report lasers and optics | detectors and electronics | software Optical room CVBG stretching / Fiber Injection closing series      130   Fri Aug 19 16:03:17 2022 Manar Amer Fixed report lasers and optics | detectors and electronics | software Optical room Alignment / Table setup closing series      129   Fri Aug 19 16:02:33 2022 Manar Amer Fixed report lasers and optics | detectors and electronics | software Optical room CELIA amplifier installation + chiller Closing series      128   Fri Aug 12 17:48:28 2022 Ronic Chiche Fixed report lasers and optics Optical room "ThomX" CELIA Amplifier commissionning this afternoon, with Fabian, we did some measurements on the 3rd stage. finally we      127   Fri Aug 12 11:46:17 2022 Ronic Chiche Fixed info lasers and optics Optical room OEwaves lock and Finesse measurement this morning, I locked the FP cavity with the OEwaves CW laser and the "Fred fiber amplifier" used at 500mA of pump current.      126   Thu Aug 11 19:27:09 2022 Ronic Chiche Fixed info lasers and optics | detectors and electronics Optical room Koheras CW laser lock on FP cavity I locked the Koheras CW on the FP cavity but the lock was pretty noisy and very difficult to acquire.      125   Thu Aug 11 12:11:48 2022 Ronic Chiche Fixed report lasers and optics Optical room "ThomX" CELIA Amplifier commissionning Beam size at the amplifier output: to make this measurement, I switched ON only 1st and 2nd stage.      124   Wed Aug 10 12:51:16 2022 Ronic Chiche Fixed report lasers and optics Optical room "ThomX" CELIA Amplifier commissionning The "ThomX" CELIA amplifier is installed on the optical table. I added all the rubber pieces available      123   Mon Aug 8 17:58:32 2022 Ronic Chiche Fixed info lasers and optics Optical room Pulse duration measurement before and after CVBG (as a strecher) I recorded the pulse shape of the MENHIR 216MHz in its fiber injection setup. the fiber is then connected to the      122   Mon Aug 8 11:11:28 2022 Aurélien Martens Fixed report utilities Optical room chiller for CELIA amplifier today, temperature of the chiller has been set to 23°C. measured temperature in the chiller      121   Thu Jul 28 13:52:23 2022 Aurélien Martens Fixed report utilities Optical room chiller for CELIA amplifier The chiller of CELIA amplifier has been moved from the corridor to the changing room in front of PLIC.       120   Fri Jul 22 18:25:31 2022 Manar Amer Fixed report lasers and optics | detectors and electronics | software Optical room CELIA amplifier installation + chiller The software to control the CELIA amplifier is on the laptop that was placed in ThomX bunker.      119   Fri Jul 22 18:19:13 2022 Manar Amer Fixed report lasers and optics | detectors and electronics | software Optical room CVBG stretching / Fiber Injection Before injecting into the amplifier, the pulse needs to be stretched using a CVBG, type attached.  7x    118   Fri Jul 22 18:00:21 2022 Manar Amer Fixed report lasers and optics | detectors and electronics | software Optical room Alignment / Table setup The current setup of the optical table attached. The cavity is aligned and the lock      117   Fri Jul 22 17:10:06 2022 Manar Amer Fixed report lasers and optics | detectors and electronics Optical room Installation of D-shaped mirror / Alignment The D-shaped mirrors are installed properly and not cutting the path of the beam. The cavity has been aligned again      116   Fri Jul 22 17:07:32 2022 Manar Amer Fixed report lasers and optics | detectors and electronics | software Optical room CELIA amplifier installation + chiller Amplifier placed next to the pulsed laser on the table under the airflow The output is in free space with      115   Tue Jul 12 19:07:50 2022 Manar Amer Fixed report lasers and optics | detectors and electronics | software Optical room CELIA amplifier installation The amplifier was installed on the optical table next to SBox table. The CVBG that will be used for      114   Tue Jul 12 18:53:55 2022 Manar Amer Fixed report lasers and optics | detectors and electronics Optical room Installation of D-shaped mirror / Alignment To prepare for the amplifier. I installed the D-shapped mirrors after cleaning (using aceton and ethanol) between the cavity 2      113   Tue Jul 12 14:41:55 2022 Manar Amer Fixed report lasers and optics | detectors and electronics Optical room FSR change & Finesse Measurements a Finesse of 30k with the present mirrors : T1=120 ppm ;A1=(2.6+1) ppm;      112   Tue Jul 12 10:19:30 2022 Manar Amer Fixed report lasers and optics | detectors and electronics Optical room FSR change & Finesse Measurements Yesterday evening the cavity was Vacuum pumped up to pressure of 5.5*10^-2 and locked  changed FSR to be 216.662 MHz and      111   Tue Jul 12 10:07:05 2022 Manar Amer Fixed report lasers and optics | detectors and electronics Optical room FSR change & Finesse Measurements The FSR of the 2 mirror (plan-spherical) Cavity was adjusted from 210 MHz to reach 216.643 MHz      110   Fri Jul 8 19:37:24 2022 Manar Amer Fixed report lasers and optics | detectors and electronics Optical room 2 Mirror Setup @ 216.6 MHz Update for Finesse measurement, The cavity was put under vacuum ~ 1.1*10^-1 mbar and the alignment and coupling      109   Fri Jul 8 17:48:48 2022 Manar Amer Fixed report lasers and optics | detectors and electronics Optical room 2 Mirror Setup @ 216.6 MHz The cavity was realigned using irises instead of pinholes, gave a better alignment. The inside of the box, the spherical      108   Fri Jul 8 17:10:44 2022 Manar Amer Fixed report lasers and optics Optical room Images of ThomX mirrors Mirror images in the previous log showing the metal deposit of the coating of the spherical mirrors      107   Fri Jul 8 17:09:26 2022 Manar Amer Fixed report lasers and optics Optical room Images of ThomX mirrors Under the microscope, the spherical mirrors show the deposit of metal dots on the reflecting surface      106   Wed Jul 6 19:57:17 2022 Manar Amer Fixed report lasers and optics | detectors and electronics Optical room 2 Mirror Setup @ 216.6 MHz The SBox cavity setup was changed to have only 2 mirrors M1 plane and M2 spherical, both from ThomX      105   Wed Jul 6 18:39:38 2022 Manar Amer Fixed report lasers and optics | vacuum Optical room SBox Finesse at 216.6625 MHz        104   Wed Jul 6 18:39:25 2022 Manar Amer Fixed report lasers and optics | vacuum Optical room SBox Finesse at 216.6625 MHz Max Finesse obtained @ 4 mirror setup was ~ 19 300   With M1 from ThomX , M2/M3/M4 from      103   Wed Jul 6 18:37:02 2022 Manar Amer Fixed report lasers and optics Optical room Divergence of the CW beam after collimator Closing the series of the telescope for the beam @ 133.33 MHz        102   Wed Jul 6 18:35:38 2022 Manar Amer Fixed report lasers and optics Optical room Fundamental Mode TEM00 Closing series of 00 mode for FSR @ 133.33 MHz        101   Wed Jul 6 18:34:12 2022 Manar Amer Fixed report lasers and optics | detectors and electronics | software Optical room Cavity Lock Closing the series for the setup The cavity was only locked @ 133.33 MHz but the Finesse was not measured      100   Mon Jun 27 08:52:46 2022 Manar Amer Fixed report lasers and optics | vacuum Optical room SBox Finesse at 216.6625 MHz The Sbox currently has the injection from ThomX installed T ~ 120 ppm , M2 planar from Sbox spare and M3 / M4 spherical mirrors      99   Tue Jun 21 23:52:28 2022 Manar Amer Fixed report mechanics | lasers and optics | detectors and electronics Optical room Menhir Pulsed Laser The SBox Length (FSR), was changed to match the repetition rate of the Menhir pulsed laser Frep = 216.6625 MHz      98   Thu Jun 9 19:59:42 2022 Manar Amer Fixed report lasers and optics | detectors and electronics | software Optical room Cavity Lock Cavity locked today under vacuum and no airflow, it is stable over a long time the alignment was improved and      97   Wed Jun 8 11:31:47 2022 Manar Amer Fixed report lasers and optics | detectors and electronics | software Optical room Cavity Lock Current setup at SBox for locking the cavity After spacial matching, the coupling increased to ~ 15 - 20 %       96   Wed Jun 8 11:24:35 2022 Manar Amer Fixed report lasers and optics Optical room Telescope - Spacial Matching Divergence of the CW beam out of the collimator measured after 1 meter to be  2       95   Wed Jun 8 11:10:17 2022 Manar Amer Fixed report lasers and optics | detectors and electronics | software Optical room Cavity Lock Start with the cavity lock images attached, taken from last week, at start we have a coupling ~ 5%  and started      94   Wed Jun 8 10:58:15 2022 Manar Amer Fixed report lasers and optics Optical room Fundamental Mode TEM00 Images of the Transmitted beam at M2 mirror at different days.  The first one was from last week,      93   Wed Jun 8 10:47:45 2022 Manar Amer Fixed report lasers and optics Optical room SBox Alignment Closing Series for Alignment. Beating observed, beam is in the locking stages      92   Wed May 25 17:34:29 2022 Manar Amer Fixed report lasers and optics Optical room Fundamental Mode TEM00 Adding images from the transmission after the spherical mirrors M3 and M4 window for a resonating mode inside the cavity.      91   Tue May 24 22:11:40 2022 Manar Amer Fixed report lasers and optics Optical room Fundamental Mode TEM00 The current setup for the SBox has a beam viewer and 2 photodiodes placed at reflection and transmission.      90   Tue May 24 22:05:48 2022 Manar Amer Fixed report lasers and optics Optical room SBox Alignment The external and internal alignment was redone. External Alignment : the collimator  7x    89   Tue May 24 21:51:01 2022 Manar Amer Fixed report lasers and optics | utilities Optical room Spincoater - Mirrror cleaning While repeating the alignment, the mirrors were cleaned using the spin-coater and placed again.      88   Wed May 11 21:10:27 2022 Manar Amer Fixed report lasers and optics Optical room SBox Alignment M2 Sbox changed to spare. Alignment of M2 was redone.  With the help of Ronic , We observe      87   Wed May 11 20:51:28 2022 Manar Amer Fixed report lasers and optics | utilities Optical room Spincoater - Mirrror cleaning Following the observation that when rotating M2 plan mirror of SBox the deformation position of the mode changes.      86   Wed May 11 09:19:48 2022 Manar Amer Fixed report lasers and optics Optical room SBox Alignment Yesterday, to find the source of why the mode is deformed, I tried to rotate the mirrors to see if there is a change.      85   Mon May 9 19:27:35 2022 Manar Amer Fixed report lasers and optics | utilities Optical room Spincoater - Mirrror cleaning PowerPoint shows the detailed images of all the mirrors before and after cleaning. Images of SBox mirrors and M1 from      84   Mon May 9 19:05:35 2022 Manar Amer Fixed report lasers and optics Optical room SBox Alignment Today; replaced the M1 SBox mirror with M1 from gamma factory , following the previous alignment.      83   Mon May 9 18:36:48 2022 Manar Amer Fixed report lasers and optics Optical room SBox Alignment Last week In FP cavity we had all SBox mirrors including the damaged M1 mirror. The beating was observed with just      82   Wed Apr 27 22:30:14 2022 Manar Amer Fixed report lasers and optics | utilities Optical room Spincoater - Mirrror cleaning Images of the SBox mirrors cleaned at the same time when the cavity was aligned. Directly from the spincoater to      81   Wed Apr 27 22:13:37 2022 Manar Amer Fixed report lasers and optics Optical room SBox Alignment Finished the alignment of the SBox with M1 of SBox placed, to be changed to gamma factory mirror later      80   Tue Apr 26 20:08:10 2022 Manar Amer Fixed report lasers and optics Optical room SBox Alignment Adjust the placement of the Irises  (done at the start of the  9x    79   Mon Apr 25 18:02:09 2022 Manar Amer Fixed report lasers and optics Optical room SBox Alignment Remember to update the position of the reference Irises tomorrow !!!!      78   Mon Apr 25 17:58:01 2022 Manar Amer Fixed report lasers and optics Optical room SBox Alignment After pointers and Advice from Aurélien, improvement of the beam alignment through M1 and M2 irises was done.      77   Mon Apr 25 17:28:29 2022 Manar Amer Fixed report lasers and optics Optical room SBox Alignment SBox alignment, using CW laser Koheras power 1 mW  6x    76   Wed Apr 20 19:05:37 2022 Manar Amer Fixed report lasers and optics Optical room KBox Alignment Starting with the alignment of the KBox using CW Koheras. The size of the CW output from  7x    75   Wed Apr 13 18:42:50 2022 Manar Amer Fixed report lasers and optics | utilities Optical room Spincoater - Mirrror cleaning Used the spincoater and pure water to clean dielectric mirrors which will be installed inside the SBox for directing the reflection      74   Fri Apr 8 19:27:12 2022 Manar Amer Fixed issue detectors and electronics | utilities Optical room Clean Airflow Dust measurements Dust measurement done today on  top of the SBox average 10min      73   Mon Apr 4 13:58:23 2022 Manar Amer Fixed issue detectors and electronics | utilities Optical room Clean Airflow Dust measurements The dust meter cap was cleaned using Alcohol, and using the filter white cap the dust count was (0 Av. 10 min)      72   Thu Mar 31 13:29:01 2022 Manar Amer Fixed report mechanics | lasers and optics | utilities Optical room Dust Cleaning of SBox After an overnight where the cavity box was left open, a measurement of the Dust meter was taken:      71   Wed Mar 30 18:53:01 2022 Manar Amer Fixed report mechanics | lasers and optics | utilities Optical room Dust Cleaning of SBox The inside of the cavity was cleaned today. It was very dirty and had big dust particles and fibers inside.  6x    70   Tue Mar 29 16:27:34 2022 Manar Amer Fixed report utilities Optical room Spincoater - Mirrror cleaning In preparation for cleaning the mirrors. The spincoater has been moved with its bump into the sas of the SBox.      69   Tue Mar 29 16:23:00 2022 Manar Amer Fixed report lasers and optics | cabling Optical room Mightylaser Amplifier Migthylaser amplifier has been moved from the SBox table to the PLIC table.        68   Wed Mar 23 18:17:45 2022 Manar Amer Fixed report utilities Optical room Dust Cleaning of SBox The cleaning was done twice with half an hour interval between the two times reading on the dust meter was taken      67   Wed Mar 23 18:11:22 2022 Manar Amer Fixed report utilities Optical room Dust Cleaning of SBox An Initial cleaning of the KBoX outside was done, All the optics and mechanics placed that were on the table were removed.      66   Mon Jul 5 14:46:44 2021 Manar Amer Fixed report lasers and optics | detectors and electronics Optical room OEwaves CW Laser - Phase Noise correction on unit 1030 nm      65   Mon Jul 5 14:40:57 2021 Manar Amer Fixed report lasers and optics | detectors and electronics Optical room OEwaves CW Laser - Phase Noise a correction on the wavelength of the laser  it is 1030 um       64   Mon Jul 5 14:14:01 2021 Manar Amer Fixed report lasers and optics | detectors and electronics Optical room OEwaves CW Laser - Phase Noise We started measuring the phase noise on the OEwaves CW laser. Class 3b wavelength 1.5 um The      63   Thu Jun 10 17:55:15 2021 Ronic Chiche Fixed info lasers and optics Optical room Origami SN2440 133MHz laser tests Today, we received the Origami SN2440 133MHz oscillator from repair (NKT mentioned a defective wire inside the controller....)      62   Tue Jan 12 10:44:57 2021 Ronic Chiche Fixed issue lasers and optics Optical room Origami SN2440 133MHz laser power measurment... and failure we received from NKT the Origami SN2440 133MHz oscillator from repair on 2020/12/17 and we measured the power trend from      61   Tue Jan 5 12:38:04 2021 Manar Amer Fixed report lasers and optics Optical room Transmission Measurements for the Mirrors. Thursday 10 December 2020:   First Test Measurement - Inside Box  The transmission ( T ) for the mirrors of SBOX  6x    60   Wed Dec 16 12:36:37 2020 Loïc Amoudry Fixed report lasers and optics Optical room Mirror's cleaning and microscope imaging On 10th of december 2020 we cleaned the SBOX mirrors and took microscope images (the name of the images indicates what they  14x    57   Thu Feb 6 16:58:57 2020 Loïc Amoudry Fixed report lasers and optics Optical room Power up to 48kW crater effect again As we said, after glow discharge and spin coater we recovered a low power finesse ~23000 (aligning away from the M1 crater).      56   Thu Feb 6 11:01:08 2020 Ronic Chiche Fixed report lasers and optics Optical room analysis of stored and reflected power with this Finesse around 22-23k, the technique comparing TRANSMISSION and REFLECTION signals doesn't work, even in taking into account      55   Wed Feb 5 16:46:01 2020 Loïc Amoudry Fixed report lasers and optics Optical room SBOX mirrors cleaned Today we put the cavity to vacuum (~ 0.1 mBar) and we measured again the Finesse with Koheras and modulation technique.      54   Wed Feb 5 14:47:16 2020 Loïc Amoudry Fixed report lasers and optics Optical room SBOX mirrors cleaned Yesterday, after installation and alignment of mirrors and cavity, the Finesse has been measured with cavity at air pressure, with      53   Wed Jan 29 19:04:38 2020 Loïc Amoudry Fixed report lasers and optics Optical room SBOX mirrors cleaned Today, SBOX mirrors have been cleaned with spin coater on HR face and isoprop on back face. They show similar spots as before.      52   Wed Jan 29 19:00:02 2020 Loïc Amoudry Fixed report lasers and optics Optical room Glow discharge cleaner on SBOX mirrors The glow discharge cleaner has been tested on the SBOX mirrors. I've put them 1 by 1. Each      51   Fri Jan 24 17:58:45 2020 Loïc Amoudry Fixed info lasers and optics Optical room CFBG removed from ThomX CELIA amplifier The CFBG has been removed successfully and the amplifier is closed now. The soldering machine had a calibration      50   Fri Jan 24 17:56:11 2020 Loïc Amoudry Fixed info lasers and optics Optical room AFM analysis of M2 We had enough time to proceed a quick scan of M2 which has also a hole but not centered on the mirror.      49   Fri Jan 24 17:52:14 2020 Loïc Amoudry Fixed report lasers and optics Optical room AFM analysis of M1 AFM has been proceeded on M1 and M2. The pdf shows the first images taken with the PLIC room Leica microscope      48   Fri Jan 24 16:16:24 2020 Ronic Chiche Fixed report lasers and optics Optical room analysis of stored and reflected power A chart which summarizes the data we have or we can estimate.      47   Fri Jan 10 18:51:23 2020 Ronic Chiche Fixed report lasers and optics Optical room analysis of stored and reflected power the 10th of January, we increased the power of the amplifier to study the cavity transmitted and reflected power signals.  6x    46   Thu Jan 9 16:54:05 2020 Loïc Amoudry Fixed report lasers and optics Optical room Microscope and cleaning of SBOX mirrors The mirrors went in the cavity the 28th of november (We did several power up to 30kW stored and only one to 40kW then      45   Thu Dec 19 16:23:39 2019 Ronic Chiche Fixed info lasers and optics Optical room Cavity beam axis moving with power how the cavity beam axis is moving during a lock when the cavity is hot ? could it explain a part of the Transmission  9x    44   Thu Dec 19 16:03:17 2019 Ronic Chiche Fixed info lasers and optics Optical room Beam size behind M2 Yesterday, we tried to better adapt positions of the telescope lenses, dynamically, during the lock, to improve the matching between      42   Thu Dec 19 09:21:45 2019 Ronic Chiche Fixed info lasers and optics Optical room Optical amplifier polarization state polarization state of the cavity at higher power : 20kW, 30kW  and 33kW (slight CEP and alignment optimization) :      41   Tue Dec 17 17:58:12 2019 Ronic Chiche Fixed info lasers and optics Optical room Beam size behind M2 the telescope matchs the cold cavity beam, so it is normal to have a power decrease on the transmission photodiode when the cavity      40   Tue Dec 17 17:54:38 2019 Ronic Chiche Fixed info lasers and optics Optical room Optical amplifier polarization state The polarimeter was giving a strange 50% of DOP of the light coming from the cavity.      39   Tue Dec 17 12:16:54 2019 Ronic Chiche Fixed info lasers and optics Optical room Optical amplifier polarization state We placed a PBS + 2 photodiodes (PhD1, PhD2) at the output of the amplifier to check how the polarization of the amplifier changes      38   Tue Dec 17 10:56:08 2019 Ronic Chiche Fixed report lasers and optics Optical room first data with 3A on the 3rd stage 2 pictures : typical beam with HOM typical beam after moving the D-shape      37   Tue Dec 17 10:46:24 2019 Ronic Chiche Fixed info lasers and optics Optical room Beam size behind M2 Beam diameter behind M2 : - 2nd stage @ 6A - 1kW inside cavity sx = 2120 µm      36   Fri Dec 13 18:28:00 2019 Ronic Chiche Fixed report lasers and optics Optical room first data with 3A on the 3rd stage Today, at 3A on the 3rd stage, we saw some HOM effects. the transmissions is about 100mW which      35   Fri Dec 13 15:56:22 2019 Ronic Chiche Fixed issue lasers and optics Optical room 2nd stage amplifier issue 2nd stage output power was going down. We checked the pump diode technical data sheet and the operating temperature is [25°C:35°C].      34   Thu Dec 12 11:49:05 2019 Ronic Chiche Fixed issue lasers and optics Optical room 2nd stage amplifier issue Last time, we switched ON directly the 2nd stage at 6A without increasing/decrinsing slowly the current.      33   Wed Dec 11 17:13:02 2019 Ronic Chiche Fixed issue lasers and optics Optical room 2nd stage amplifier issue the 2nd stage amplifier needed several hours (4-5h) to reach its nominal power (we look at photodiode level on a scope), instead      32   Tue Dec 10 09:36:56 2019 Ronic Chiche Fixed info lasers and optics Optical room FSR and Finesse measurement Yesterday the cavity has been aligned and locked with the CW Koheras laser. the FSR has been measured by modulation      31   Fri Dec 6 11:54:58 2019 Loïc Amoudry Fixed report lasers and optics Optical room Mirror's installed The initial 400kW SBOX mirrors which have been cleaned ont 28th of november have been installed this morning on the SBOX.      30   Fri Dec 6 11:53:53 2019 Loïc Amoudry Fixed report lasers and optics Optical room Mirror's cleaning XPS has been proceeded on the 400kW SBOX mirrors M3 and M4 (the initial cavity spherical mirrors) in frebruary 2019. Deposited a lot      29   Wed Nov 13 13:15:53 2019 Loïc Amoudry Fixed report lasers and optics Other AFM+ InfraRed spectroscopy (IR spectro) has been performed AFM+ InfraRed spectroscopy (IR spectro) has been performed on 400kW S-BOX mirrors. Seems that XPS made M3 and M4 dirty,      59   Mon Jun 24 16:15:08 2019 Huan Wang Fixed info lasers and optics Optical room amplifier I just had a phone call with Jérome and he told me 2 things : * Be carefull ! the MightyLaser      58   Wed Jun 19 18:54:00 2019 Huan Wang Fixed info lasers and optics Optical room amplifier Onefive output power is 24mW now, and 2.41mW(after EOM) injected into fiber, a injection power monitor      28   Fri Feb 1 14:04:27 2019 Loïc Amoudry Fixed info lasers and optics Other Meeting with LMA people, AFM 30/01/19 - The following powerpoint shows the results discussed with LMA people. What came out from the discussion      27   Fri Feb 1 13:45:19 2019 Loïc Amoudry Fixed report lasers and optics Other AFM performed on S-BOX mirrors 29/02/19 - AFM has shown that spots on mirror's surfaces are bumps and not holes.      26   Thu Jan 24 17:49:54 2019 Loïc Amoudry Fixed report lasers and optics Optical room Impacts on mirror's surface All the mirrors show impacts on there surface (some of them do not show deposit). Does it come from experiments or fabrication ?      25   Thu Jan 24 17:44:21 2019 Loïc Amoudry Fixed report lasers and optics Optical room Deposit on S-box mirrors after return from LMA Cleaning on dirty surface shows something is deposited on the surface. Cleaning displaces and removes part of the deposit.      24   Fri Dec 21 13:42:43 2018 Loïc Amoudry Fixed info lasers and optics Optical room Mirrors features, come back from LMA Mirrors arrived today from LMA. Their features are damaged. Photos avant ou après nettoyage,      23   Thu Nov 15 13:02:44 2018 Loïc Amoudry Fixed info lasers and optics Optical room Mirrors cleaning The new mirrors didn't give expected results. Then the 4 old mirrors have been sent to LMA on 12/11/18 for a cleaning and      22   Mon Nov 5 13:11:08 2018 Loïc Amoudry Fixed report lasers and optics Optical room First run with spare mirrors I (A)      21   Wed Oct 31 14:06:17 2018 Loïc Amoudry Fixed report lasers and optics Optical room M1 transmission measurement At different positions, transmission give 194, 193, 208, 200 ppm?      20   Wed Oct 31 14:04:50 2018 Loïc Amoudry Fixed report lasers and optics Optical room M4 transmission measurement Loïc      19   Wed Oct 31 14:03:22 2018 Loïc Amoudry Fixed report lasers and optics Optical room M4 transmission measurement The kept transmission for M4 is 2.17 ppm. Which is the value measured after alignement (center of the      18   Wed Oct 31 13:51:17 2018 Loïc Amoudry Fixed info lasers and optics Optical room Change of the 3 ULE mirrors by 3 spare ULE mirrors First finesse measurement 20 266, FSR 133.351 MHz under vacuum      17   Wed Oct 31 13:48:58 2018 Loïc Amoudry Fixed report lasers and optics Optical room M1 transmission measurement Center of M1: I      16   Wed Oct 31 13:44:22 2018 Loïc Amoudry Fixed report lasers and optics Optical room Finesse vs power by difference between main and second resonance Measurement on 25/10/2018      15   Wed Oct 31 13:43:28 2018 Loïc Amoudry Fixed report lasers and optics Optical room Finesse vs power by difference between main and second resonance Measurement on 24/10/18      14   Wed Oct 31 13:43:03 2018 Loïc Amoudry Fixed report lasers and optics Optical room Polarization frequency Measurement on 30/10/18.      13   Wed Oct 31 13:42:22 2018 Loïc Amoudry Fixed report lasers and optics Optical room Polarization frequency Check of the frequency of the onefive locked on each polarization of the cavity (tilt a waveplate by 45°).      12   Wed Oct 31 11:36:30 2018 Loïc Amoudry Fixed report lasers and optics Optical room Finesse vs power by difference between main and second resonance Measurements show that ratio decrease versus power. BUT, the second resonance measurement induce lower power in the cavity so the ratio      11   Wed Oct 31 11:27:49 2018 Loïc Amoudry Fixed report mechanics | lasers and optics Optical room Power measurement with D-shape Measurements of lot of points with D-shape mirrors well positionned. Power not optimized to the best      10   Fri Oct 19 11:46:21 2018 Loïc Amoudry Fixed report lasers and optics Optical room Beam size vs D-shape position Matlab code for size vs position and power :  clear all      9   Fri Oct 19 11:23:27 2018 Loïc Amoudry Fixed report lasers and optics Optical room Beam size vs D-shape position Measurement done on 18/10/18. At high power, the shape of the 0.0 mode does not change. The D-shape only      8   Fri Oct 19 11:13:40 2018 Loïc Amoudry Fixed report lasers and optics Optical room Transmission vs D-shape position at different powe Measurements have been done on 18/10/18. Datas are on excel file, also matlab file.      7   Thu Oct 18 09:42:39 2018 Loïc Amoudry Fixed report mechanics | lasers and optics Optical room Motors for D-shaped mirrors Motors have been installed on 16/10/18. No problem with them. Effect of the motors tested on      6   Tue Oct 9 10:19:29 2018 Loïc Amoudry Fixed report lasers and optics Optical room Record power-up Measurement made on 03/10/18 (nothing has been done since there). Stable power in the cavity of 225      5   Tue Oct 9 10:15:17 2018 Loïc Amoudry Fixed report lasers and optics Optical room Polarization optimization Optimization of the polarization has been made the 03/10/18. Checked in reflection of the cavity in reflection&transmission      4   Mon Oct 1 15:19:48 2018 Loïc Amoudry Fixed report lasers and optics Optical room Phase measurement with HASO with just intensity, the coupling is 98%, and with phase, x direction coupling is 95%, y direction 97%, so the telescope is good.      3   Mon Oct 1 14:27:35 2018 Loïc Amoudry Fixed report lasers and optics Optical room Phase measurement with HASO * Loic has to fix the number of files (3) regarding the number of measurements (2) * splitted Intensity and phase  8x    2   Mon Oct 1 11:30:39 2018 Loïc Amoudry Fixed report lasers and optics Optical room Phase measurement with HASO 2 measurement. First one locked, in transmission of M2 with 2nd stage 0A.Total 89 cm from      1   Wed Sep 26 18:12:44 2018 Loïc Amoudry Fixed info lasers and optics Optical room Cavity polarization states (Koheras), Finesse of 2 polarization states Measurments of Finesse with the 2 polarization states, let's call them H (higher) and L (lower): 24500 for the H and 23500 for

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