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ID Date Author Typedown Category Subject Text Attachments
  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 
  187   Thu Jun 19 23:16:50 2014 KojiOpticsGeneralAll of the prisms have been glued- All of the PRISM mirrors have been glued
- 4 out of 5 beam dumps have been
glued
 P6196525.JPG 
  188   Fri Jun 20 18:59:12 2014 KojiOpticsGeneralAll of the invar blocks have been gluedAll of the INVAR blocks have been glued.
I found thinner shims in the stock.
On Monday, the template will be removed.
  
  189   Mon Jun 23 21:54:16 2014 KojiOpticsGeneralAll of the gluing completedThe bottom-side templates were removed.
The last beam dump was removed
TODO
  
  196   Sun Jul 6 02:45:56 2014 KojiOpticsGeneralFSR Measurement3rd OMC FSR / Finesse measurement
RF AM was injected by detuning a
HWP.
 finesse_measurements_log.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 
  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 
  217   Wed Aug 27 23:13:13 2014 KojiOpticsCharacterizationCollection of the power budgetting infoL1
OMC Cavity power budget
H1
  
  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 
  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 
  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 
  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 
  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
  
  269   Fri Sep 9 19:43:32 2016 KojiOpticsGeneralD1102211 OMC Diode Mount Glass Block went to DownsD1102211 OMC Diode Mount Glass Block (11pcs)
have been given to Calum@Downs
  
  270   Mon Nov 21 21:19:20 2016 KojiOpticsGeneralLWE NPRO Laser / Input Optics / Fiber Coupling- About 1.5 month ago, an 700mW LWE NPRO
has been brought to OMC Lab.

- The SOP can be found here.
  
  271   Wed Dec 7 19:18:10 2016 KojiOpticsGeneralLWE NPRO Laser / Input Optics / Fiber CouplingFIber Input Mount 132deg
Fiber output mount 275deg
-> 525mW P: 517mW S: 8mW extinction
  
  277   Tue May 16 19:05:18 2017 KojiOpticsConfigurationOMC SN002 fix - temporary opticsWorking on the SN002 OMC fix. Checked the
inventory. I think I am using C8 mirror as
the new temporary CM1 and PZT24 as the new
  
  281   Fri Jun 23 01:58:11 2017 KojiOpticsGeneralOMC #002 Repair - CM1 gluing[Alena, Koji]

Jun 21: Alena and Koji
worked on gluing of the CM1 mirror on the
 6x 
  282   Fri Jun 23 10:55:07 2017 KojiOpticsGeneralDust layer on black glass beam dumps?I wondered why the black glass beam dumps
looked not as shiny as before. It was in
fact a layer of dusts (or contaminants) accumulated
 black_glass_dust.JPG 
  283   Sat Jul 1 15:29:57 2017 KojiOpticsGeneralBlack glass cleaning / Final bonding for the emergency repair for OMC #002[Alena, Koji] 

Report of the work on June
30.
 DSC_0347.jpgDSC_0348.jpgDSC_0350.jpgDSC_0352.jpgDSC_0354.jpg 
  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   
  294   Sat May 5 22:51:04 2018 KojiOpticsGeneral3IFO EOM Optical testThe 3IFO EOM test performed at
the 40m. Result: 40m
ELOG 13819
  
  295   Tue May 15 19:53:45 2018 KojiOpticsGeneralEOM Q comparisonQs' were estimated with a lorentzian
function (eye fit)

  
  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 
  308   Sun Sep 23 19:42:21 2018 KojiOpticsGeneralMontecarlo simulation of the phase difference between P and S pols for a modeled HR mirror[Koji Gautam]


With Gautam's help,
I ran a coating design code for an HR mirror
 reflectivities.pngtransmission.pngphase_diff.pngphase_difference_histogram.png 
  309   Thu Sep 27 20:19:15 2018 AaronOpticsGeneralMontecarlo simulation of the phase difference between P and S pols for a modeled HR mirrorI started some analytic calculations of
how OMC mirror motion would add to the noise
in the BHD. I want to make some prettier
  
  310   Thu Nov 1 19:57:32 2018 AaronOpticsGeneralMontecarlo simulation of the phase difference between P and S pols for a modeled HR mirrorI'm still not satisfied/done with the
solution to this, but this has gone too long
without an update and anyway probably someone
  
  311   Thu Jan 10 20:42:54 2019 KojiOpticsCharacterizationFSR / HOM Test of OMC SN002OMC SN002 = Former LHO OMC
which CM1 was destroyed by the lock loss
pulse in 2016. This OMC needs to be optically
  
  312   Thu Jan 10 20:45:00 2019 KojiOpticsCharacterizationPZT test cableAs OMC SN002 already has the PZTs connected
to the Mighty-Mouse connector, a test cable
with a female mighty-mouse connector was
 OMC_PZT_wiring.pdf 
  313   Sat Jan 12 22:49:11 2019 KojiOpticsCharacterizationPM-SM patch cable mode cleaning effectMode
cleaning capability of an optical fiber was
measured. The conclusion
 fiber_mode_cleaning.pdf 
  315   Sat Feb 2 16:17:13 2019 KojiOpticsCharacterizationSummary: OMC(001) HOM structure recalculationEach peak of the transfer function measurement
was fitted again with a complex function:

 OMC_HOM_130531.pdfHOM_PZTV.pdfHOM_plot_PZT0_0.pdfCav_scan_response_HOM.pdf 
  316   Sat Feb 2 20:03:19 2019 KojiOpticsCharacterizationSummary: OMC(002) HOM structure recalculation (before mirror replacement)OMC (002)
History: Measurement date
2013/10/11, Installed to L1 2013/XX
 OMC_HOM_131011.pdfHOM_PZTV.pdfHOM_plot_PZT0_0.pdfCav_scan_response_PZT_HOM.pdf 
  317   Sat Feb 2 20:28:21 2019 KojiOpticsCharacterizationSummary: OMC(003) HOM structure recalculationOMC (003)
History: Measurement date
2014/7/5, Stored for I1, Installed to H1
 OMC_HOM_140705.pdfHOM_PZTV_PZT1_0V.pdfHOM_plot_PZT0_0.pdfCav_scan_response_PZT_HOM.pdf 
  318   Sat Feb 2 20:35:02 2019 KojiOpticsCharacterization Summary: OMC(002) HOM structure recalculation (after mirror replacement) OMC (002) after repair
History:Mirror replacement
after the damage at H1. Measurement date
 OMC_HOM_190110.pdfHOM_PZTV.pdfHOM_plot_PZT0_0.pdfCav_scan_response_PZT.pdf 
  322   Fri Apr 5 01:07:18 2019 KojiOpticsCharacterizationOMC(002): transmitted beam imagesThere was a concern that the transmission
from CM1 has additional fringes. The shape
of the transmitted beams from CM1, CM2, and
 CM1trasns.pngCM2trasns.pngFM2trans2.png 
  323   Fri Apr 5 01:08:17 2019 KojiOpticsCharacterizationOMC(002): DCPD / QPD alignmentThe beam height in the cavity became totally
different from the previous one and the shims
needed to be much thicker than before. This
 IMG_7521.JPGIMG_7529.JPGIMG_7539.JPGIMG_7541.JPG 
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