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ID Date Author Status Type Category Location Title Text Attachments
  83   Tue Nov 26 16:21:27 2019 Loïc AmoudryFixedissuevacuumOptical roomPneumatic valvesThe pneumatic valves are now plugged on
the university air network.
The air valve is fully openned for		   
  82   Tue Nov 26 16:11:52 2019 Ronic ChicheFixedissuemechanicsOptical roomFirst Lock with 2nd satge of amplifier : Motor issue ? The 500 ms noise disapeared. We had to
disable the "power save" mode of
the smaract translation stage. AND turn OFF		   
  81   Fri Nov 22 17:56:56 2019 Ronic ChicheFixedissuelasers and optics | detectors and electronicsOptical room30Hz noise issuesince some days, we observe the cavity
is difficult to lock and a strange 30Hz noise
has appeared on the PZT signal which normally		   
  80   Thu Nov 21 11:37:13 2019 Loïc AmoudryFixedinfolasers and opticsOptical roomOnefive Origami 33MHz specsBeam Size Onefive added




 beam_size.xlsxBeam_size_Onefive_33.rar 
  79   Wed Nov 13 15:05:18 2019 Loïc AmoudryFixedreportlasers and opticsOptical roomAmplifier output power  




 courbedichro.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 
  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 
  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 
  75   Fri Oct 11 18:49:00 2019 Ronic ChicheFixedinfodetectors and electronicsOptical roomNew locking schemeBefore, the locking scheme was to produce
an error signal with the PDH box, send its
output to the electronic amplifier box and		   
  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.		   
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