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ID Date Author Type Categorydown Subject Text Attachments
  6   Fri Jun 29 11:26:04 2012 ZachOpticsCharacterizationRoC measurement setupHere is the proposed RoC measurement
setup. Koji tells me that this is referred
to as "Anderson's method".
 RoC_measurement_setup.pngRoC_measurement_setup.graffle.zip 
  8   Wed Jul 18 23:20:13 2012 KojiOpticsCharacterizationMode scan results of ELIGONic Smith sent me a bunch of elog lists
where the results of the mode scan can be
found.
  
  9   Sun Jul 22 15:56:53 2012 ZachOpticsCharacterizationRoC measurement setupHere is a more detailed version of
the setup, so that we can gather the parts
we will need.
 detailed_RoC_setup.pngdetailed_RoC_setup.graffle.zip 
  31   Thu Oct 18 20:23:33 2012 KojiOpticsCharacterizationImproved measurementSignificant
improvement has been achieved in the RoC
 Cav_scan_response_zoom_20121017.pdfdetailed_RoC_setup.pdf 
  32   Wed Nov 7 01:28:20 2012 KojiOpticsCharacterizationWedge angle test (A1)Wedge
angle test
Result: Wedge angle of Prism A1:
 wedge_measurement.pngwedge_measurement_setup.png 
  35   Thu Nov 8 13:24:53 2012 KojiOpticsCharacterizationMore wedge measurementA1
Horiz Wedge    0.497   
+/-    0.004 deg
 wedge_measurement_overall.pdf 
  39   Fri Nov 9 00:43:32 2012 KojiOpticsCharacterizationFurther more wedge measurementNow it's enough for the first OMC (or even
second one too).
Today's measurements all distributed
 wedge_measurement_overall.pdf121108a_A1.pdf 
  40   Sat Nov 17 02:31:34 2012 KojiOpticsCharacterizationMirror T testMirror T test
The mirror was misaligned to have
~2deg incident (mistakenly...) angle.
  
  41   Mon Nov 19 13:33:14 2012 KojiOpticsCharacterizationResuming testing mirror RoCsIn order to resume testing the curvatures
of the mirrors, the same mirror as the previous
one was tested.
 Cav_scan_response_zoom_20121016.pdf 
  42   Mon Nov 26 01:40:00 2012 KojiOpticsCharacterizationMore RoC measurementC1: RoC: 2.57845 +/− 4.2e−05m
 RoC_measurement.pdf 
  44   Tue Dec 18 20:04:40 2012 KojiOpticsCharacterizationPrism Thickness MeasurementThe thicknesses of the prism mirrors (A1-A5)
were measured with micrometer thickness gauge.
Since the thickness of the thinner
 prism.png 
  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
  
  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
  
  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 
  72   Fri Mar 15 02:15:45 2013 KojiElectronicsCharacterizationDiode testingDiode testing
o Purpose of the measurement
- Test Si QPDs (C30845EH) for ISC
 QPD_GR_TEST_130316.pdf 
  73   Sun Mar 17 21:59:47 2013 KojiElectronicsCharacterizationDiode testing ~ DCPD- For the dark noise measurement, the lid
of the die-cast case should also contact
to the box for better shielding. This made
 OMCPD_TEST_130317.pdf 
  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 
  78   Sat Mar 23 16:36:15 2013 KojiElectronicsCharacterizationDiode QE measurementQuantum efficiencies of the C30665GH
diodes were measured. 
- The diode was biased by the FEMTO
 P3213308.JPGP3213310.JPG 
  92   Wed Apr 3 17:39:38 2013 KojiMechanicsCharacterizationCalibration of the test PZTs before the glue testWe want to make sure the responses of the
PZT actuator does not change after the EP30-2
gluing.
 P4033491.JPGshadow_sensor_calib.pdf 
  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
  
  98   Fri Apr 5 14:39:26 2013 KojiMechanicsCharacterizationCalibration of the test PZTs after the heat cureWe attached fused silica windows on the
test PZTs. http://nodus.ligo.caltech.edu:8080/OMC_Lab/93
The glued assemblies were brought
 shadow_sensor_calib_after_bake.pdfPZTresponse.pdf 
  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
  
  102   Mon Apr 8 11:49:18 2013 KojiMechanicsCharacterizationPZT actuator tested at LLOTest result of the PZTs by Valera and Ryan
PZT  Length Angle
 #
  [nm/V] [urad/um]
 11  14.5   17.6
  
  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)
  
  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 
  
  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
  
  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 
  124   Mon May 13 14:49:35 2013 KojiMechanicsCharacterizationMounting Glass Bracket still broke with tightenin stress[Koji / Jeff]
This is the elog about the work on
May 9th.
  
  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 
  137   Wed Jun 5 01:06:35 2013 ZachGeneralCharacterizationL1 OMC as-built diagram D1300507
 
 L1OMC_asbuilt.pdf 
  145   Tue Jun 18 10:01:11 2013 KojiOpticsCharacterizationCavity Finesse analysisThis is the analysis of the cavity finesse
data taken on  Apr/13/2013 (before baking),
May/30/2013 (after baking), and Jun/02/2013
 finesse_measurements.pdf 
  148   Sat Jul 6 17:10:07 2013 KojiMechanicsCharacterizationPZT Response analysisAnalysis of the PZT scan / TF data taken
on May 31st and Jun 1st.
[DC scan]
 PZT_Scan.pdfL1OMC_PZT_Response.pdf 
  154   Wed Aug 21 08:31:21 2013 KojiOpticsCharacterizationH1 OMC cavity alignmentAlignment of the H1 OMC cavity mirrors
- The cavity mirrors as well as the
first steering mirror were aligned on the
  
  158   Tue Aug 27 17:02:31 2013 KojiMechanicsCharacterizationSpot position measurement on the diode mountsAfter the PZT test, the curved mirrors
were aligned to the cavity again.
In order to check the height of the
 DCPD1.png 
  159   Thu Aug 29 02:52:50 2013 KojiOpticsCharacterizationH1OMC Curved Mirror AlignmentCavity
parameter was measured with 50V bias on PZT1
(CM1)
 Cav_scan_response_130828_Pitch.pdfCav_scan_response_130828_Yaw.pdf 
  163   Fri Aug 30 12:24:28 2013 KojiOpticsCharacterizationH1OMC Spot positionsBeam heights on the diodes

DCPD1: 14.459mm -> With 1.5mm
 DCPD1.pngDCPD2.pngQPD1.pngQPD2.png 
  169   Mon Oct 14 13:40:16 2013 KojiOpticsCharacterizationH1 OMC Optical testingSince the middle of September, the optical
tests of H1 OMC were took place.
Here is summary of the progress.
  
  170   Mon Oct 14 15:50:55 2013 KojiOpticsCharacterizationH1 OMC Power budgetLHO OMC power budget

    
 OMC_power_budget.pdf 
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