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ID Date Author Type Categorydown Subject Text Attachments
  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 
  253   Sun Mar 13 21:22:27 2016 KojiElectronicsCharacterizationDark current measurement of the HQE PD and other PDsTransfered for RGA scan

B4 (C1-05) -> F1
C1 (C1-07) -> F2
  
  254   Sun Mar 13 22:02:09 2016 KojiOpticsCharacterizationHQEPD QE measurement (direct comaprison)Direct comparison of the PD responsibities

We
can expect 5% increase of the QE with the
  
  255   Sat Mar 26 01:49:48 2016 KojiOpticsCharacterizationHQEPD QECalibration
of the transimpedance

Use KEITHLEY 2450 as a calibrated
 QE1.pngQE2.png 
  256   Sat Mar 26 17:39:50 2016 KojiElectronicsCharacterizationHQEPD dark noiseDark noise measurement for 6 HQEPDs and
1 C30665. All of these showed sufficiently
low dark current noise levels compared with
 PD_dark_current.pdf 
  257   Sat Mar 26 18:22:24 2016 KojiElectronicsCharacterizationBaking / Contamination tests of the PDsFor the production of the aLIGO PDs, the
following transfer of the PDs were carried
out
  
  259   Tue Apr 5 18:22:40 2016 KojiElectronicsCharacterizationBaking / Contamination tests of the PDsPossible
reduction of the QE was observed after air-bake
at 75degC.
 QE_after_air_bake.pdf 
  260   Tue Apr 5 21:20:15 2016 KojiElectronicsCharacterizationMore dark noise measurementAll survived PDs have been measured.  PD_dark_current.pdf 
  266   Tue Aug 23 23:36:54 2016 KojiOpticsCharacterizationInspection of the damaged CM1 (prev H1OMC)1. Calum and GariLynn checking the CM1
defect from the front side.
2. Same as above
 7x 
  267   Thu Aug 25 02:17:09 2016 KojiOpticsCharacterizationInspection of the damaged CM1 (prev H1OMC)Initial inspection results by Calum, et
al.
https://dcc.ligo.org/LIGO-E1600268
  
  276   Tue Mar 28 21:04:27 2017 KojiElectronicsCharacterizationPDH ampAttachment 1: PDH amp
RF part (before the preamp was installed)

Attachment 2:
 6x 
  286   Sat Jul 29 18:44:38 2017 ranaElectronicsCharacterizationPDH ampattachment 6: DCPD preamp looks like the
opamp is wired for positive feedback?
  
  287   Sat Jul 29 21:42:51 2017 KojiElectronicsCharacterizationPDH ampThe polarities indicated in the right circuits
were opposite, obviously.
  
  291   Thu Feb 22 20:21:02 2018 KojiOpticsCharacterizationaLIGO EOM testPOSTED
to 40m ELOG
  
  292   Mon Apr 2 17:27:04 2018 KojiOpticsCharacterizationaLIGO EOM test2nd optical test http://nodus.ligo.caltech.edu:8080/40m/13725   
  296   Wed May 30 16:40:38 2018 KojiMechanicsCharacterizationEOM mount stability testhttps://awiki.ligo-wa.caltech.edu/wiki/EOM_Mount_Stability   
  297   Wed May 30 17:44:23 2018 KojiOpticsCharacterization3IFO EOM surface check3IFO EOM dark microscope images courtesy
by GariLynn and Rich

Attachment1/2: Hole #1
 IMG_5756.JPGIMG_5757.JPGIMG_5758.JPGIMG_5759.JPGLooking_at_Hole2.png 
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