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ID Date Author Status Type Category Location Title Text Attachments
  74   Fri Oct 11 18:42:32 2019 Ronic ChicheFixedissuelasers and optics | detectors and electronicsOptical roomFirst Lock with 2nd satge of amplifier : Finesse issue ?First of all, we used and optical spectrometer
to determine which proportion of pump and
signal is in the injected beam.		   
  73   Thu Oct 10 18:03:10 2019 Ronic ChicheFixedissuemechanicsOptical roomFirst Lock with 2nd satge of amplifier : Motor issue ? Global locking almost clean : tranmission
and reflection are quite noiseless except
the peaks at every 500ms.		  Image1.png 
  72   Thu Oct 10 17:51:26 2019 Ronic ChicheFixedissuelasers and optics | detectors and electronicsOptical roomFirst Lock with 2nd satge of amplifier : Finesse issue ?1st lock today with the second stage of
the amplifier.
~ 300mW of injected power (but which		   
  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 
  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		   
  69   Wed Oct 9 10:10:01 2019 Loïc AmoudryFixedinfolasers and opticsOptical roomFree Spectral Range (FSR)FSR is 33.347 MHz @1e-8 mbar

 		   
  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 
  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 
  66   Thu Oct 3 14:00:13 2019 Loïc AmoudryFixedissuecablingOptical roomElectrical trouble (disjunction)The circuit breaker on ThomX cavity drops
@1.5-1.8kW when we turn on 1/2nd
stage of the amplifier or 3rd stage of the		   
  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		   
  64   Thu Oct 3 13:49:58 2019 Loïc AmoudryFixedinfomechanicsOptical roomPneumatic valvesFrederic and Manu from vacuum group came
this morning to fix again the pneumatic valves
which had a leak again.		   
  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		   
  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 
  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.		   
  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		   
  59   Wed Sep 25 15:49:28 2019 Ronic ChicheFixedissuemechanics | detectors and electronicsOptical roomMotor issueToday again, same problem with axis 9 blocking
the controlling software during the mirror
alignment procedure.		   
  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		   
  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		   
  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 
  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		   
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