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New entries since:Wed Dec 31 16:00:00 1969
ID Date Author Typeup Category Subject Text Attachments
  49   Mon Dec 31 03:11:45 2012 KojiOpticsCharacterizationFurther more RoC measurementTotal (excluding C2, C7, C8): 2.575 +/-
0.005 [m]
New results
 Cav_scan_response_zoom_20121125_C6_9.pdf 
  50   Wed Jan 2 07:35:55 2013 KojiOpticsCharacterizationThickness of a curved mirrorMeasured the thickness of a curved mirror:
Took three points separated by 120
degree.
  
  51   Wed Jan 2 07:45:39 2013 KojiOpticsCharacterizationFirst Contact testConclusion:
Good. First contact did not damage the coating
surface, and reduced the loss
 Cav_scan_response_zoom_20121125_C2_before.pdfCav_scan_response_zoom_20121125_C2_after.pdf 
  53   Thu Jan 10 18:37:50 2013 KojiOpticsCharacterizationWedging of the PZTsYesterday I measured the thickness of the
PZTs in order to get an idea how much the
PZTs are wedged.
 PZT_wedging.pdf 
  54   Wed Jan 16 14:10:50 2013 KojiOpticsCharacterizationAutocollimator tests of optics perpendicularity/parallelismThe
items:
- Autocollimator (AC) borrowed from
  
  55   Fri Jan 18 13:25:17 2013 KojiOpticsConfigurationAutocollimator calibrationAn autocollimator (AC) should show (0,0)
if a retroreflector is placed in front of
the AC.
 autocollimator_calibration.pdf 
  56   Sat Jan 19 20:47:41 2013 KojiOpticsCharacterizationWedge measurement with the autocollimatorThe wedge angle of the prism "A1"
was measured with the autocollimator (AC).
The range of the AC is 40 arcmin.
 autocollimator_wedge_measurement.pdf 
  59   Mon Feb 4 00:39:08 2013 KojiOpticsCharacterizationWedge measurement with the autocollimator and the rotation stageMethod:

    Mount the tombstone prism
on the prism mount. The mount is fixed on
 autocollimator_wedge_measurement.pdf 
  60   Wed Feb 6 02:34:10 2013 KojiOpticsCharacterizationWedge measurement with the autocollimator and the rotation stageMeasurement:

    A6:   α
= 0.665 deg, β = +3.0 arcmin (1.5 div
  
  62   Thu Feb 7 23:01:45 2013 KojiOpticsCharacterizationUV epoxy gluing test [Jeff, Yuta, Koji]
Gluing test with UV-cure epoxy
Optocast 3553-LV-UTF-HM
  
  63   Thu Feb 21 18:44:18 2013 KojiOpticsConfigurationPerpendicularity testPerpendicularity test of the mounting
prisms:
The perpendicularity of the prism
 perpendicularity_test.pdfP2203206.JPG 
  64   Wed Feb 27 18:18:48 2013 KojiOpticsConfigurationMore perpendicularity testMounting Prisms:
(criteria: 30arcsec = 145urad =>
0.36mm spot shift)
  
  65   Fri Mar 1 23:06:15 2013 KojiOpticsConfigurationMore perpendicularity test finalPerpendicularity of the "E" mirror
was measured.

Mounting Prisms:
  
  66   Fri Mar 1 23:52:18 2013 KojiOpticsCharacterizationWedge measurement with the autocollimator and the rotation stageMeasurement:

    E1:   α = 
0.672 deg, β = +0.0  arcmin (0 div up)
  
  67   Tue Mar 5 19:37:00 2013 ZachOpticsCharacterizationeLIGO OMC visibility vs. power measurement detailsEDIT (ZK): Koji points out that (1 -
Ti) should really be the non-resonant reflectivity
of the aligned cavity, which is much closer
 eOMC_visibility_3_4_13.png 
  68   Wed Mar 6 23:24:58 2013 ZachOpticsCharacterizationeLIGO OMC visibility vs. power measurement detailsI found that, in fact, I had lowered
the modulation depth since when I measured
it to be 0.45 rads --> Psb = 0.1.
 TEK00005.PNGTEK00007.PNGeOMC_visibility_3_4_13.pngeOMC_AMTF_vs_power_3_6_13.png 
  74   Wed Mar 20 09:38:02 2013 ZachOpticsCharacterization[LLO] OMC test bench modified For various reasons, I had to switch
NPROs (from the LightWave 126 to the Innolight
Prometheus).
 new_setup_traced.jpg 
  76   Sat Mar 23 02:41:00 2013 KojiOpticsGeneralBlack glass beam dumps for the first OMCReceived black glass beam dumps from
MIT
- gluing by EP30-2 looks pretty fine.
 P3223314.JPGP3223319.jpgP3223320.jpg 
  77   Sat Mar 23 13:34:14 2013 KojiOpticsGeneralPZT assembly prototype glued 
Prototype
PZT assembly
 P3223322.jpgP3223323.jpgP3233336.jpgP3233348.jpg 
  81   Mon Mar 25 19:31:16 2013 KojiOpticsGeneralOMC Top-side gluing[Koji Jeff Zach]  
AAA
 P3253353.jpgP3253372.jpgP3253394.jpgP3253400.jpg 
  86   Thu Mar 28 03:37:07 2013 ZachOpticsConfigurationTest setup input optics progress[Lisa, Zach]
Last night (Tuesday), I finished
setting up and aligning most of the input
 OMC_test_setup_IO.jpg2013-03-27_05.48.20.jpg2013-03-28_02.29.36.jpg 
  87   Fri Mar 29 08:55:00 2013 ZachOpticsConfigurationBeam launched into fiber

    

       
            
  
  88   Mon Apr 1 03:13:41 2013 KojiOpticsGeneralFailure of PZT-glass joints[Koji, Jeff, Zach, Lisa]
We glued a test PZT-mirror assembly
last week in order to make sure the heat
  
  89   Mon Apr 1 03:23:48 2013 KojiOpticsGeneralUV power calibration[Koji Lisa Jeff Zach]
Eric G bought a UV power meter from
American Ultraviolet.
  
  91   Mon Apr 1 18:17:01 2013 KojiOpticsGeneralMirror curvature center testLocations of the curvature minimum
on the OMC curved mirrors have been measured.
 6x 
  93   Wed Apr 3 18:42:45 2013 KojiOpticsGeneralEP30-2 gluing testEP30-2 gluing test
  
  94   Thu Apr 4 00:35:42 2013 ZachOpticsConfigurationMMT installed on breadboard, periscope built[Koji, Zach]
 2013-04-03_23.43.00.jpg 
  95   Thu Apr 4 01:35:04 2013 KojiOpticsCharacterizationMode matching to the OMC cavityThe fiber output was matched with the lenses
on a small bread board.
The detailed configuration is found
  
  96   Thu Apr 4 01:43:06 2013 KojiOpticsCharacterizationMirror T measurement[Zach, Koji]
The measurement setup for the transmission
measurement has been made at the output of
  
  97   Thu Apr 4 23:44:52 2013 KojiOpticsConfigurationBeam launched into fiberWe had to move our flipper mirror to share
the beam between Peter's setup and ours as
our flipper is at the place where the ISS
  
  99   Fri Apr 5 18:18:36 2013 ZachOpticsConfigurationAOM probably broken

    

       
            
 Isomet_1250C_zin_4_5_13.png 
  100   Mon Apr 8 11:11:37 2013 KojiOpticsCharacterizationMore Mirror T measurementMore Ts of the mirrors were measured.
A mirror specification:
Request: 8300+/-800 ppm
  
  101   Mon Apr 8 11:29:08 2013 KojiOpticsCharacterizationMirror/PZT Characterization links
    Mirror
List
    http://nodus.ligo.caltech.edu:8080/OMC_Lab/152
  
  103   Mon Apr 8 20:56:52 2013 KojiOpticsConfigurationPZT & Curverd Mirror arrangementAssembly #1:
Mounting Prism #16
PZT #26
 PZT_assembly.pdf 
  104   Mon Apr 8 21:11:14 2013 KojiOpticsGeneralPZT assembly gluing[Jeff, Zach, Koji] 
PZT assembly gluing
Glue gun -> to be returned to
  
  105   Mon Apr 8 23:42:33 2013 KojiOpticsConfigurationFake OMC roughly alignedMode matching:
 
 beam_profile.pdfmode_matching.pdf 
  106   Tue Apr 9 13:56:09 2013 KojiOpticsGeneralPZT assembly post gluing / pre baking pictures 
  
  107   Wed Apr 10 00:40:30 2013 ZachOpticsConfigurationfauxMC locked[Koji, Zach]
 fauxMC_labeled.jpg 
  109   Fri Apr 12 09:25:31 2013 KojiOpticsCharacterizationAlignment of the OMC (without glue)[Zach Koji]
The first attempt not to touch the
curved mirrors did not work. (Not surprising)
  
  110   Sat Apr 13 21:06:02 2013 KojiOpticsGeneralOMC Bottom-side: cavity glued[Jeff, Zach, Lisa, Koji]
Gluing of the cavity mirrors went
 Cav_scan_response_130412_Pitch.pdfCav_scan_response_130412_Yaw.pdf 
  111   Tue Apr 16 00:40:45 2013 KojiOpticsGeneralPD/QPD path gluing ~ preparation[Jeff Koji]
- Placed the optics on the PD/QPD
path
  
  112   Tue Apr 16 08:12:14 2013 KojiOpticsCharacterizationFurther More Mirror T measurementT&Rs of the B mirrors and some of the
E mirrors are measured.
I found that 
  
  113   Tue Apr 16 09:43:58 2013 KojiOpticsConfigurationMirror list for L1OMCL1 OMC
Cavity Mirrors
FM1 (input coupler): A8
 OMC_breadboard_mirror_config.png 
  114   Tue Apr 16 23:26:51 2013 KojiOpticsCharacterizationFurther More Mirror T measurementSince the previous measurement showed too
high loss, the optical setup was checked.
It seemed that a PBS right before
  
  115   Wed Apr 17 07:30:04 2013 KojiOpticsGeneralQPD path gluedYesterday,
all of the glass components for the QPD path
were glued.
  
  120   Mon May 6 19:31:51 2013 KojiOpticsCharacterizationSpot position measurement on the diode mountsMeasurement Order: DCPD2->DCPD1->QPD1->QPD2
DCPD1: 1.50mm+0.085mm => Beam
0.027mm too low
 DCPD1.pngDCPD2.pngQPD1.pngQPD2.png 
  121   Wed May 8 15:08:57 2013 KojiOpticsCharacterizationSpot position measurement on the diode mountsRemeasured the spot positions:
DCPD1: 1.50mm+0.085mm => Beam
0.084mm too high
 DCPD1.pngDCPD2.pngQPD1.pngQPD2.png 
  132   Thu May 30 15:00:28 2013 KojiOpticsGeneralQPD alignmentThe QPD alignment was adjusted using
the aligned beam to the cavity and the 4ch
transimpedance amplifier.
  
  133   Fri May 31 05:46:54 2013 KojiOpticsGeneralQPD alignmentPeter F suggested to check the bottom surface
of the PD housings if there is any protrusion/interference/whatever.
And that was true! It was found that
 QPD1.JPGQPD2.JPGQPD_calib.nb.zip 
  134   Fri May 31 14:07:54 2013 KojiOpticsCharacterizationTransverse Mode Spacing measurement afte the baking Measurement for pitch
Free Spectral Range
(FSR): 264.9703 +/− 0.0007 MHz
 Cav_scan_response_130530_Pitch.pdfCav_scan_response_130530_Yaw.pdf 
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