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ID Date Author Status Typedown Category Location Title Text Attachments
  37   Tue May 21 17:49:30 2019 Loïc AmoudryFixedreportlasers and opticsOptical roomFinesse after cleaning (new suprasil mirror)15/05/19-20/05/19:

Cleaning of the mirrors:

Initial finesse 14000 @air		   
  38   Thu May 23 10:10:56 2019 Ronic ChicheFixedreportlasers and opticsOptical roomFinesse measurement by decay time technique5 Files attached:

- Note on the technique and results
for the present cavity on 2019, May 21th		  2019-05-21_-_Finesse_measurement_by_decay_time_technique.docxtek0005CH1.isftek0006CH1.isfplotdata.mmyerror.m 
  39   Thu May 23 17:30:03 2019 Loïc AmoudryFixedreportlasers and opticsOptical roomTransmission of Sapphire mirrorSee image.  Sapphire_transmission.PNG 
  40   Tue Jun 11 18:03:10 2019 Loïc AmoudryFixedreportmechanics | lasers and opticsOtherAmplifier mission BordeauxVoyage Bordeaux au CELIA avec Jérôme
LHERMITE (Loïc et Titoutan)

1er jour (34°) :		  1st_and_2nd_stage.jpg3rd_stage_pumps.jpg3rd_stage_signal.jpg 
  41   Wed Jun 12 12:07:11 2019 Loïc AmoudryFixedreportmechanics | lasers and opticsOtherAmplifier mission BordeauxM² mesuré à 10W.
M²x = 1.17
M²y = 1.14		  Ampli_ThomX.PNGM2_ThomX.png 
  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		   
  56   Fri Sep 6 14:48:14 2019 Loïc AmoudryFixedreportmechanics | vacuumOptical roomPrimary vacuum to check dustThe cavity has been cleaned then put under
primary vacuum (primary pump without vacuum
flow control). Dusts presence was checked		  Image3.jpgImage6.jpg 
  58   Thu Sep 12 16:19:26 2019 Loïc AmoudryFixedreportmechanics | lasers and opticsOptical roomCavity dust source checkSeveral experiments have been done in order
to check the potential source of dust in
the ThomX cavity. For each step, we look		   
  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		   
  65   Thu Oct 3 13:53:44 2019 Loïc AmoudryFixedreportvacuumOptical roomCavity under vacuum The cavity is right now at 6.5e-8 mbar
(turbo pumps on for 1 night and ionic pumps
for 3h), primary pumps and turbo pumps are		   
  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 
  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 
  79   Wed Nov 13 15:05:18 2019 Loïc AmoudryFixedreportlasers and opticsOptical roomAmplifier output power  




 courbedichro.PNG 
  88   Fri Feb 7 14:46:55 2020 Ronic ChicheFixedreportlasers and opticsOptical roomBeam pulse durationWe installed the 2 CVBG for compression
after the amplifier.
We used an interferometric technique		  interferences.avipulse_duration.png 
  89   Wed Feb 12 17:43:43 2020 Ronic ChicheFixedreportlasers and opticsOptical roomBeam pulse durationYesterday, Loic installed a telescope before
CVBG's to reduce the spot size on CVBG's
and reduced the incident angle 0.5-1°		  pulse_width.png 
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