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ID Date Author Type Categoryup Subject Text Attachments
  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 
  171   Tue Oct 15 18:50:08 2013 KojiOpticsCharacterizationQPD alignment1) Deburr the bottom surfaces of the QPD
housings
2) Aligned the QPDs
  
  172   Wed Oct 16 19:16:29 2013 KojiOpticsCharacterizationPD alignment 
 shim 1.5mm 001/002
  
  180   Mon Mar 3 02:46:21 2014 KojiGeneralCharacterizationSpot positions scannedSpot positions on CM1 and CM2 scanned according
to the recipes provided by the previous entry.
The best result obtained was:
  
  181   Tue Mar 25 17:10:10 2014 KojiOpticsCharacterizationOMC spot position estimationSpot positions were inferred from the photos  OMC_spot.pdf 
  183   Mon May 12 22:43:02 2014 KojiOpticsCharacterizationMeasured FSR/TSM of the OMC cavityData analysis of the FSR/TSM measruement
last week.
1. FSR was measured with "the
 Cav_scan_response_Pitch.pdfCav_scan_response_Yaw.pdf 
  184   Wed May 14 02:15:15 2014 KojiOpticsCharacterizationFSR/TSM adjustment of the OMC cavity 1. FSR was adjusted and measured with "the
golden arches" technique again.
FSR = 264.8412 MHz +/- 1400Hz =>
 Cav_scan_response_140503_Pitch.pdfCav_scan_response_140503_Yaw.pdf 
  185   Fri May 16 00:13:36 2014 KojiOpticsCharacterizationCavity mirror gluing part 1BS1/FM1/FM2 for I1OMC were glued.
FM1 had to be intentionally rotated.
FM1 had to be intentionally shifted
  
  186   Sat May 17 07:40:14 2014 KojiOpticsCharacterizationI1OMC cavity mirrors gluedI1OMC cavity mirrors were glued.
FSR = 264.82MHz => Lcav = 1.132m
(nominal 1.132m)
 Cav_scan_response_140516_Pitch.pdfCav_scan_response_140516_Yaw.pdf 
  197   Sun Jul 6 02:46:20 2014 KojiOpticsCharacterizationOMC power budget3rd OMC power budget (2014/7/2)
Input power: 34.8mW
  
  198   Sun Jul 6 03:56:40 2014 KojiOpticsCharacterizationHOM measurement with PZT vol sweptCavity FSR/TMS measurement (2014/7/5) with
PZT voltages swept from 0V to 200V (50V step)
 Cav_scan_response_PZT1.pdfCav_scan_response_PZT2.pdfOMC_HOM_140705.pdf 
  199   Sun Jul 6 08:31:14 2014 KojiOpticsCharacterizationHOM measurement with PZT vol swept3rd OMC, HOM diagram at PZT1=0V and PZT2=50V.
First coincidence with the carrier
is the 32nd-order carrier mode. Very good.
 HOM_plot.pdf 
  202   Tue Jul 8 18:54:54 2014 KojiMechanicsCharacterizationPZT characterizationEach PZT was swept with 0-150V 11Hz triangular
wave.
Time series data for 0.2sec was recorded
 PZT_Scan.pdfI1OMC_PZT_Response.pdf 
  205   Thu Jul 10 23:22:28 2014 KojiOpticsCharacterizationI1OMC QPDQPD#             
QPD1      
QPD2
  
  206   Fri Jul 11 00:06:33 2014 KojiOpticsCharacterizationI1OMC PDDCPD#            
DCPD1      DCPD2
Housing#         
  
  207   Sun Jul 13 17:46:28 2014 KojiOpticsCharacterizationOMC backscatter measurementBackscattering
reflectivity of the 3rdOMC was measured.

Attached: Measurement setup
 OMC_backscatter.pdf 
  208   Tue Jul 15 03:00:42 2014 KojiOpticsCharacterizationOMC backscatter measurementPresence of the misaligned SRM (T=20%)
was forgotten in the previous entry.
This effectively reduces the OMC reflectivity
  
  209   Tue Jul 15 03:34:16 2014 KojiOpticsCharacterizationOMC backscatter measurementBackscatter
measurement ~ 2nd round


Summary
 OMC_backscatter.pdfOMC_backscatter.png 
  210   Thu Jul 17 02:19:20 2014 KojiMechanicsCharacterizationI1OMC vibration testSummary
- The breadboard has a resonance
at 1.2kHz. The resonant freq may be chagned
 6x 
  211   Sun Jul 20 17:19:50 2014 KojiMechanicsCharacterizationI1OMC vibration test ~ 2nd roundImproved
vibration measurement of the OMC
Improvement
 9x 
  213   Mon Jul 21 01:02:43 2014 KojiMechanicsCharacterizationSome structual mode analysisPrisms
Fundamental: 12.3kHz Secondary: 16.9kHz
 6x 
  217   Wed Aug 27 23:13:13 2014 KojiOpticsCharacterizationCollection of the power budgetting infoL1
OMC Cavity power budget
H1
  
  218   Tue Sep 9 20:59:19 2014 KojiMechanicsCharacterizationStructural mode analysis for the PZT mirrorStructural analysis of the PZT mirror with
COMSOL.
Inline figures: Eigenmodes
 6x 
  241   Tue Sep 8 11:18:10 2015 KojiOpticsCharacterizationPBS Transmission measurementMotivation: Characterize
the loss of the Calcite Brewster PBS.

Setup: (Attachment
 setup.JPGCaF2Prism.jpgCaF2Prism2.JPG 
  242   Wed Sep 9 01:58:34 2015 KojiOpticsCharacterizationPBS Transmission measurementCalcite Brewster PBS Continued

The
transmission loss of the Calcite brewster
  
  243   Thu Sep 10 04:03:42 2015 KojiOpticsCharacterizationMore polarizer optics measurement (Summary)Brewster calcite PBS (eLIGO
Squeezer OFI)

Loss L = 3600 +/- 200ppm
 eLIGO_PBS.pdfHWP.pdfTFP.pdfGlasgow_PBS.pdf 
  244   Wed Sep 23 17:49:50 2015 KojiOpticsCharacterizationMore polarizer optics measurement (Summary)For the Glasgow PBS, the measurement has
been repeated with different size of beams.
In each case, the PBS crystal was
 Glasgow_PBS_spotsize.pdf 
  245   Tue Dec 15 13:38:34 2015 KojiElectronicsCharacterizationEOM Driver linearity checkLinearity of the EOM driver was
tested. This test has been done on Nov 10,
2015.
 Output_linearity.pdfCtrl_Bias.pdf 
  246   Tue Dec 15 13:39:13 2015 KojiElectronicsCharacterizationPhase noise measurement of aLIGO EOM driversThis measurement has been done on Dec 1st,
2015.


The phase noise added by
 phase_noise.pdfphase_noise_9MHz.pdf 
  247   Tue Dec 15 13:42:37 2015 KojiOpticsCharacterizationDimensions / packaging of HQE PDsThe dimensions of a high QE PDs was measured
as well as the ones for C30665. (Attachment
4, Unit in mm)
 PC147842.jpgPC147846.jpgPC147848.jpgHQEPD_dimension.pdf 
  251   Sat Feb 20 19:11:22 2016 KojiElectronicsCharacterizationDark current measurement of the HQE PD and other PDsDark current of the HQE PD and
other PDs were measured.

- The HQE PDs were loaded on the
 P2197992.jpgPD_dark_current.pdfPD_dark_current_others.pdf 
  252   Sun Mar 6 02:13:28 2016 KojiOpticsCharacterizationPD glass reflectionsOn friday, I removed a glass cover of a
G30655 with a PD can cutter.

When a beam shoots a Perkin Elmer/Excelitas
 P3048124.JPGP3048125.JPG 
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