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ID Date Author Status Type Category Location Title Text   7   Mon Apr 19 19:11:47 2021 Manar Amer Fixed report mechanics | software Other Distances between mirrors   At the reference zero the distance between the mirrors is (taken from a reference presentation "status9nov2020"      8   Tue Apr 27 13:57:15 2021 Manar Amer Fixed report lasers and optics Other Alignment using Koheras Following the Helium Neon Alignment + change in the distance between the mirrors to be; M3-M4 = 90.5 mm , M1-M2 = 80.2 mm  -→  6x    9   Thu Apr 29 06:14:09 2021 Manar Amer Fixed report lasers and optics Other Mode observed and cavity Lock ** Following up from yesterday an observation about the TM00 mode : it has been seen with similar dimensions and its position is the      10   Fri Apr 30 17:41:10 2021 Aurélien Martens Fixed report lasers and optics | detectors and electronics Optical room Lock, cavity length and finesse estimate Ronic just suceeded in obtaining a reasonably good lock on the cavity. Air flow is switched off.      11   Tue May 4 15:56:33 2021 Manar Amer Fixed report mechanics | lasers and optics | software Other Distances between mirrors New update on the position of the Motors for the cavity ***** we moved      12   Fri May 7 15:40:10 2021 Ronic Chiche Fixed info lasers and optics Optical room Theoretical Finesse, Gain and Coupling For spherical mirrors M3 and M4 (batch C117I054) the reflectance (R) is around 99.9987% (if T+R=1 => T=13ppm)      14   Wed Jun 30 20:29:17 2021 Manar Amer Fixed report lasers and optics Other Mode observed and cavity Lock New configuration is made. The new mode observed in NF_Trans is the following :      16   Tue Sep 7 11:05:47 2021 Aurélien Martens Fixed report lasers and optics | detectors and electronics Optical room Lock, cavity length and finesse estimate we observed that the transmitted light coming from the cavity is made of the cavity mode light and the scattered light on the      17   Tue Sep 7 14:27:07 2021 Blanc Fixed info lasers and optics Optical room Polarisation Results of the NKT I made many tests about polarization and we can see some points thanks to the following figures :      18   Tue Sep 7 17:48:50 2021 Blanc Fixed info lasers and optics | detectors and electronics Optical room Locking of the cavity and setup changing We change the setup a bit to have the same polarization on the photodiode and the PDH (in reflexion of the cavity). CF: schematics      19   Wed Sep 8 10:50:38 2021 Blanc Fixed info lasers and optics Optical room Polarisation Results of the NKT To have the polarisation, we must have 1 value because the laser in entry of the system has 1 polar. Due to that, the graphe      20   Thu Sep 9 16:34:37 2021 Blanc Fixed info lasers and optics Optical room Ring light in the cavity We put a diaphragm in the input beam but it doesn't work to suppress the ring light only but it attenuates the whole transmitted      21   Thu Sep 16 18:23:13 2021 Blanc Fixed info lasers and optics Optical room Polarization Results in transmission After data processing, I finally find the polarization in transmissin of the FPC. As you can see below, the polarisation is not      23   Fri Oct 1 16:55:47 2021 Blanc Fixed info mechanics | lasers and optics | detectors and electronics Optical room 1GHz oscillator Frep measurement a previous cavity FSR measurement was giving a center frequency around 867.5MHz. the present 1GHz oscillator Frep measurement      24   Mon Oct 4 14:57:04 2021 Aurélien Martens Fixed info detectors and electronics | software Optical room ip adress of smaract driver the ip adress of the smaract driver is now 10.0.53.10:5000 please think about putting such      25   Mon Oct 4 15:10:17 2021 Aurélien Martens Fixed report mechanics | detectors and electronics | software Optical room new position of smaract motors following the measuremetn at 879.9 MHZ of the laser theoptical cavity length has been adjusted to that value from 876MHz setting      26   Mon Oct 4 15:24:14 2021 Aurélien Martens Fixed report lasers and optics | detectors and electronics Optical room piezo actuation range A 10V applied on the laser piezo was found to induce a frequecny change of about 5kHz, compatible with expectations from the piezo      27   Mon Oct 4 15:38:43 2021 Aurélien Martens Fixed info detectors and electronics Optical room phone is noise doing the sensitivty measurement of the piezo we observed satellite peaks around 800 to 900 Mhz. Removing the phones from      28   Tue Oct 5 11:35:16 2021 Aurélien Martens Fixed report detectors and electronics | software Optical room new position of smaract motors a cavity length measurement gave 880.9Mhz. The m1/M2 have been put to +5.1000mm both M3/M4 srill at -2.9mm      29   Tue Oct 5 12:18:34 2021 Aurélien Martens Fixed report detectors and electronics | software Optical room new position of smaract motors to find the fundamental mode we moved the cavity mirrors to new positions: +5.104mm for both planar mirrors

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