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ID Date Author Status Type Categorydown Location Title Text Attachments
  43   Tue Jun 18 20:44:34 2019 Huan WangFixedinfolasers and opticsOptical roomtelescope for Koherastelescope of Koheras is removed, information
record here:

- distance between collimator edge		  2019.06.18_telescope_of_Koheras.jpg 
  47   Thu Jul 4 18:28:55 2019 Loïc AmoudryFixedissuelasers and opticsOptical roomOnefive 33MHz unmodelockedOscillator randomly unmodelocked on 3rd
july afternoon (during oscillator power
measurement, maybe a reflection from the		   
  48   Thu Jul 4 18:30:39 2019 Loïc AmoudryFixedreportlasers and opticsOptical room2nd stage output power validated Onefive output power : 28mW
Power before fiber injection :
7.8mW		  190704_2ndstage6A_spectrum.PNG 
  50   Fri Aug 30 09:44:56 2019 Ronic ChicheFixedreportlasers and opticsOptical roomFinesse measurement after mirror cleaning using the spin coaterLast Finesse measurement in air : ~ 17
000 the 20th of may (see logbook)

28th and 29th of august, we cleanned,		   
  51   Fri Aug 30 17:46:15 2019 Ronic ChicheFixedreportlasers and opticsOptical roomFinesse measurement after mirror cleaning using the spin coatertoday I cleaned S3 with isopropanol and
then with pure water on spin coater.
Finesse is only 10 700.(coupling 50%		   
  54   Tue Sep 3 18:04:03 2019 Ronic ChicheFixedreportlasers and opticsOptical roomFinesse measurement after mirror cleaning using the spin coaterFollowing finesse measurements (start @10700): 
Clean P1 with SC (water) + isoprop
(wipe) finesse @15000		   
  55   Tue Sep 3 18:06:29 2019 Loïc AmoudryFixedinfolasers and opticsOptical roomMirrors sent to LMAMirrors have been sent today to LMA for
cleaning and maybe annealing (recuit). 3
ULE of ThomX and the fused silicate for injection		   
  57   Fri Sep 6 14:59:00 2019 Loïc AmoudryFixedinfolasers and opticsOptical roomLMA cleaning techniqueChristophe MICHEL told us more precise
informations about spin coater cleaning.

They always clean with pur water		   
  60   Fri Sep 27 10:43:17 2019 Loïc AmoudryFixedreportlasers and opticsOptical roomNew Suprasil mirror from LMA19/09/2019 : email from Chrisophe Michel
about AR coating of LMA mirrors after reading
that Ta2O5 layers can be damaged in vacuum		   
  61   Fri Sep 27 16:17:36 2019 Ronic ChicheFixedinfolasers and opticsOptical roomFinesse measurementAfter mirrors were going back from LMA
for cleaning and thermal anealing, they have
been installed in FP cavity for Finesse measurement.		   
  62   Mon Sep 30 11:20:48 2019 Loïc AmoudryFixedinfolasers and opticsOptical roomDiffusion ULE spherical mirror (S3) vs Fused Silicate injection planar mirror (P1)Observation made with IR Beam Viewer: 

The observation of P1 and S3 simultaneously
while locking shows much higher diffusion		  diffusion.jpg 
  63   Mon Sep 30 11:30:32 2019 Ronic ChicheFixedinfolasers and opticsOptical roomFinesse measurementTo complete these observations:

Finesse has been measured
on thursday, right after cleaning the cavity		   
  67   Thu Oct 3 18:00:10 2019 Loïc AmoudryFixedreportlasers and opticsOptical roomThomX amplifier M2The ThomX M2 has been measured between
1.5-1.6 for x and y		  Fit_matlab_M2.PNG 
  68   Wed Oct 9 10:08:24 2019 Loïc AmoudryFixedinfolasers and opticsOptical roomImprovement holder amplifier fiberWe've added a clamp in the 3rd stage
to prevent the pump fiber from moving and
tilting (it was tilting to the left).		  1.png2.png 
  69   Wed Oct 9 10:10:01 2019 Loïc AmoudryFixedinfolasers and opticsOptical roomFree Spectral Range (FSR)FSR is 33.347 MHz @1e-8 mbar

 		   
  70   Wed Oct 9 10:16:24 2019 Loïc AmoudryFixedinfolasers and opticsOptical roomFiber injection and onefive output powerFiber injection is finished with the new
ThomX stretching CVBG in double pass (+50%
injection power compared to K-BOX CVBG in		   
  71   Wed Oct 9 11:41:11 2019 Loïc AmoudryFixedinfolasers and opticsOptical roomOnefive spectrum and CVBG spectrumThe Onefive spectrum has shifted a little
bit to lower lambda. It's still enough
for the experiment (3mW injection of ampli		  191008_spectrumbeforecvbg.PNG191008_spectrumaftercvbg.PNG191008_beamshapeaftercvbgthomx.PNG 
  76   Tue Oct 22 09:10:45 2019 Loïc AmoudryFixedreportlasers and opticsOptical roomFirst mode degeneracy on ThomXYesterday, we've observed the first
degeneracy on ThomX cavity at ~115 kW stored.
The shape of the stored power on the oscilloscope		  degenere.PNGdegenere2.PNGdegenere3.PNGtek0000.png100kWThomX.png 
  77   Wed Nov 6 16:11:12 2019 Loïc AmoudryFixedreportlasers and opticsOptical roomSpherical mirrors at closest position. FSR, finesse and beam size.The spherical mirrors are at the closest
position to get a FSR ~=33.3435 MHz. Planar
mirrors are at the largest position.		  data_finesse.isffit_finesse_17000.pngbeamsize.PNGfit.PNG 
  78   Wed Nov 13 14:44:56 2019 Loïc AmoudryFixedreportlasers and opticsOptical roomAmplifier output power The ouput power of the ThomX amplifier
has been measured as a function of the 3rd
stage pumps current (0A is 1st and 2nd stage		  dichroic.PNGcourbe.PNGpower.xlsx 
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