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ID Date Author Status Type Category Location Title Text   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      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      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      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      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      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.      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).      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      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.      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,      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      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%        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      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      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      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.      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.      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      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 ~      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

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