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New entries since:Wed Dec 31 16:00:00 1969
ID Date Author Typeup Category Subject Text Attachments
  17   Sun May 22 23:40:45 2016 GabrieleOpticsDesignOptical levers layoutAn improved design is attached. I modified
the input telescope to avoid using shor focal
length lenses, to make it less critical,
 crime_v1.pdf 
  23   Thu Jun 16 00:47:42 2016 GabrieleOpticsDaily ProgressQuality factor measurement of a Mark Optics disk at LMA[Massimo Granata (LMA), Quentin Cassar
(LMA), Gabriele] 

This week I'm visiting LMA
 q_factors.pngloss_angle.png2016-06-13_09.50.11.jpg 
  51   Mon Jul 18 18:05:46 2016 GabrieleOpticsDaily ProgressOptical setupSmall modifications to the optical setup:


added a 1m focal lenght
lens (AR coated for 1064nm...) right before
 2016-07-18_14.33.35.jpg 
  60   Mon Jul 25 15:35:31 2016 GabrieleOpticsCharacterizationCalibration of the QPD in physical unitsThe
equations below are wrong. Please refer to https://nodus.ligo.caltech.edu:8081/CRIME_Lab/116
 crime_beam.PNGcrime_beam.PNGcrime_beam.PNGcalibrated_disk.png 
  91   Fri Aug 19 19:05:01 2016 GabrieleOpticsDaily ProgressDisk installed into the chamberI assembled the disk suspension sytem and
installed into the chamber. Although I don't
have the magnets and coils, I installed the
 10x 
  95   Sun Aug 21 13:45:56 2016 GabrieleOpticsDaily ProgressWierd behavior of ring downs and Improved setupThe last two ring downs I measured today
showed a weird behavior of the lowest modes:

 second_ring_downs.pngthird_ring_downs.png2016-08-21_08.46.11.jpg2016-08-21_13.29.24.jpg2016-08-21_13.29.32.jpg 
  101   Mon Aug 22 16:59:13 2016 Gabriele, AlastairOpticsDaily ProgressLaser polishing of the disk edgesWe set up a test facility for laser polishing
the disk edges, using the CO2 laser in the
TCS laboratory. We focused the beam with
 2016-08-22_14.47.47.jpg2016-08-22_13.52.02.jpg 
  105   Thu Sep 1 02:13:33 2016 GabrieleOpticsCharacterizationExpected frequencies for the 75 mm disks with flatsHere are the nominal parameters of the
disk with flats

 allmodes_aggregated.pdf 
  116   Tue Sep 20 15:34:00 2016 GabrieleOpticsDaily ProgressImproved optical lever layoutGoal

Improve the optical setup,
by increasing the response of the QPD to
disk motion.
 beam_profile.png2016-09-19_11.33.48.jpg2016-09-20_15.50.21.jpglayoutpng.png 
  122   Thu Sep 22 13:39:40 2016 GabrieleOpticsConfigurationUpdated design for the new C.Ri.Me. setupToday I measured the amount of space available
on the table for the new (4-fold) C.Ri.Me.
setup. It's 1050 x 1220 mm, with the
 crime_v2.pdf 
  127   Mon Sep 26 15:59:09 2016 GabrieleOpticsDaily ProgressQPD auto centeringWe have a few motorized mounts (with New
Focus picomotors) and one controller (an
old New Focus 8753, six axis total) that
 2016-09-26_15.44.02.jpg2016-09-26_15.43.45.jpgautocenter.png 
  132   Thu Sep 29 15:40:45 2016 GabrieleOpticsDesignBeam profile of new 21mW HeNe laser and tweak of optical lever designI measured the beam profile of the new
Thorlabs HeNe (21.8 mW measured). The beam
waist is 355 microns, very close to the laser
 beam_profile_all.png 
  270   Fri Jan 20 17:20:20 2017 GabrieleOpticsDaily ProgressInput part of the optical lever setup installed and alignedToday I installed and aligned part of the
optical components for the optical lever
of the new setup. For the moment being I
 optical_setup.png 
  272   Mon Jan 23 16:29:52 2017 GabrieleOpticsDaily ProgressInput part of the optical lever setup installed and alignedToday I cabled and installed the four QPD,
in a temporary position. I also assembled
four picomotor mounts that will be used for
  
  280   Fri Jan 27 14:56:55 2017 GabrieleOpticsDaily ProgressOptical lever setup completedThe four optical levers are completely
installed and aligned to a horizontal reference.

 photo_setup.pngphoto_chamber.png 
  287   Wed Feb 1 15:23:42 2017 GabrieleOpticsNoise huntingWandering line is due to the laserThe wandering line I mentioned in my previous
elog, which is spoiling most of the sensitivity,
turns out to be power noise of the laser. 
 laser_noise_rin.pngUntitled.avi 
  291   Mon Feb 6 11:19:13 2017 GabrieleOpticsDaily ProgressLaser swapThe Thorlabs laser has been misbehaving
for the whole weekend. Even after many days
being continuosly on, the wandering line
  
  295   Tue Feb 7 16:16:37 2017 GabrieleOpticsDaily ProgressLasersThe high power lasers I tested so far (the
Thorlabs 21mW and the JDSU 1125P) are noisy:
they both have wandering lines that from
 crime_v3.pdf 
  296   Wed Feb 8 17:01:01 2017 GabrieleOpticsDaily ProgressTwo laser installed, setup alignedToday I swapped out the 8mW laser
and installed two 2.5 mW lasers. I rebuilt
the input part of the optical levers and
 photo_setup_new.png 
  300   Thu Feb 9 09:30:52 2017 GabrieleOpticsDaily ProgressTwo laser installed, setup alignedThe lasers are behaving well, there is
no high noise or wandering lines. The spectrum
below is taken in air: that explains the
 Screenshot.png 
  301   Thu Feb 9 11:35:27 2017 GabrieleOpticsConfigurationQPD calibration This morning I measured the beam profiles
at the QPD positions. As expected, the beams
are not gaussian there, since we are seeing
 11x 
  311   Fri Feb 17 13:44:47 2017 GabrieleOpticsDaily ProgressSwapped picomotor and re-alignmentSince I had recurrent problems with the
picomotors used for QPD3, I swapped them
with another Newport motorized mirror that
  
  331   Fri Mar 10 16:44:13 2017 GabrieleOpticsDaily ProgressUpdated in vacuum periscope of CR0This afternoon I removed the old periscope
from CR0 and installed a new one with finely
adjustable mount, like those in the new chamber.
  
  336   Thu Mar 30 15:23:44 2017 GabrieleOpticsGeneralSwapped HeNe laser in CR0The JDSU HeNe laser 1103P that I was using
is dead. I swapped it with a JDSU 1125P borrowed
from the 40m.
  
  338   Fri Apr 7 16:19:03 2017 GabrieleOpticsDaily ProgressNew 1103P laser installedThis afternoon I installed the new Lumentum
(former JDSU) HeNe laser, model 1103P in
CR0.
  
  454   Tue Jan 30 09:19:09 2018 GabrieleOpticsConfigurationSetup for 50mm disksI realigned all optical levers to measure
the 50mm disks. In brief, I moved the input
2" mirrors, the in-vacuum 2" mirrors
  
  459   Tue Feb 13 16:28:49 2018 GabrieleOpticsConfigurationSetup resigned for 75mm disks    
  479   Thu Mar 8 09:40:10 2018 GabrieleOpticsConfigurationRealigned all optical levers to horizontal reference    
  497   Tue Mar 27 16:36:49 2018 GabrieleOpticsConfigurationOptical levers re-aligned for 50mm substrates    
  658   Fri Apr 12 09:36:54 2019 GabrieleOpticsConfigurationRealignmentI realigned the entire CR1-4 setup


ensured that beam out of
the chamber are at 6" height everywhere.
  
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