HOME SBOX THOMX MINICAV Utilities
MINICAV orders MINICAV installation MINICAV commissioning MINICAV control command
  Status of commissioning, report also here plots are reports., Page 2 of 5  Not logged in ELOG logo
 Find |  Login |  Help 
 Full | Summary | Threaded  Show only new entries   89 Entries 
Goto page Previous  1, 2, 3, 4, 5   Next  All
ID Date Author Statusdown Type Category Location Title Text Attachments
  7   Mon Apr 19 19:11:47 2021 Manar AmerFixedreportmechanics | softwareOtherDistances between mirrors
  At the reference zero the
distance between the mirrors is (taken from
a reference presentation "status9nov2020"		  20211604__Distances_Between_mirrors.pngstatus9nov2020.pptx 
  8   Tue Apr 27 13:57:15 2021 Manar AmerFixedreportlasers and opticsOtherAlignment 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 AmerFixedreportlasers and opticsOtherMode 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		  20212804_Fundamental_mode_in_cavity_2D_-_Position.png20212804_Cavity_Coupling_with_Koheras.jpg20212804_Temperature_Curve.jpg 
  10   Fri Apr 30 17:41:10 2021 Aurélien MartensFixedreportlasers and optics | detectors and electronicsOptical roomLock, cavity length and finesse estimateRonic just suceeded in obtaining a reasonably
good lock on the cavity. Air flow is switched
off.		  IMG_20210430_173331.jpg 
  11   Tue May 4 15:56:33 2021 Manar AmerFixedreportmechanics | lasers and optics | softwareOtherDistances between mirrors New update on the position of the Motors
for the cavity

***** we moved		  20210305_Distances_between_Mirrors_new_motor_set_point.png 
  12   Fri May 7 15:40:10 2021 Ronic ChicheFixedinfolasers and opticsOptical roomTheoretical Finesse, Gain and CouplingFor 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 AmerFixedreportlasers and opticsOtherMode observed and cavity Lock New configuration is made. The new mode
observed in NF_Trans is the following :

 NF_Trans__2021-06-25__16-38-56.bmp 
  16   Tue Sep 7 11:05:47 2021 Aurélien MartensFixedreportlasers and optics | detectors and electronicsOptical roomLock, cavity length and finesse estimatewe 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 BlancFixedinfolasers and opticsOptical roomPolarisation Results of the NKTI made many tests about polarization and
we can see some points thanks to the following
figures :		  Ellipsicité_NKT.PNGPolar_horizontale_fonction_pussance_NKT.PNGPolar_verticale_fonction_pussance_NKT.PNGPolarisation_Ag_VS_Diélec.PNG 
  18   Tue Sep 7 17:48:50 2021 BlancFixedinfolasers and optics | detectors and electronicsOptical roomLocking of the cavity and setup changingWe change the setup a bit to have the same
polarization on the photodiode and the PDH
(in reflexion of the cavity). CF: schematics		  scope_0.png 
  19   Wed Sep 8 10:50:38 2021 BlancFixedinfolasers and opticsOptical roomPolarisation Results of the NKTTo have the polarisation, we must have
1 value because the laser in entry of the
system has 1 polar. Due to that, the graphe		  Tableau_polar.PNG 
  20   Thu Sep 9 16:34:37 2021 BlancFixedinfolasers and opticsOptical roomRing light in the cavityWe 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 BlancFixedinfolasers and opticsOptical roomPolarization Results in transmissionAfter data processing, I finally find the
polarization in transmissin of the FPC. As
you can see below, the polarisation is not		  Polarisation_transmission_cavité.png 
  23   Fri Oct 1 16:55:47 2021 BlancFixedinfomechanics | lasers and optics | detectors and electronicsOptical room1GHz oscillator Frep measurementa 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 MartensFixedinfodetectors and electronics | softwareOptical roomip adress of smaract driverthe 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 MartensFixedreportmechanics | detectors and electronics | softwareOptical roomnew position of smaract motorsfollowing 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 MartensFixedreportlasers and optics | detectors and electronicsOptical roompiezo actuation rangeA 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 MartensFixedinfodetectors and electronicsOptical roomphone is noisedoing 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 MartensFixedreportdetectors and electronics | softwareOptical roomnew position of smaract motorsa 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 MartensFixedreportdetectors and electronics | softwareOptical roomnew position of smaract motorsto find the fundamental mode we moved the
cavity mirrors to new positions:

+5.104mm for both planar mirrors		   
Goto page Previous  1, 2, 3, 4, 5   Next  All
ELOG V3.1.4-395e101