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ID Date Author Typeup Category Subject Text Attachments
  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 
  324   Fri Apr 5 20:50:54 2019 KojiOpticsCharacterizationOMC(002): QPD alignmentQPD#             
QPD1      
QPD2
 P_20190405_215906.jpgP_20190405_215927.jpg 
  336   Mon Apr 15 21:11:49 2019 PhilipOpticsCharacterizationOMC(004): PZT testing for spare OMC[Koji, Philip]

Today we tested the functionality
of the four remaining PZTs (11,12,13 and
  
  337   Tue Apr 16 11:36:36 2019 KojiOpticsCharacterizationOMC(004): PZT testing for spare OMCAttachment 1: Shadow sensor
setup for the PZT displacement test

Attachment 2:
 9x 
  338   Tue Apr 16 16:35:09 2019 KojiOpticsConfigurationOMC(004): Glass breadboard selectionD1200105 SN006 was selected as
the breadboard for OMC(004).
The reason is the best parallelism
 BB_selection.pdf 
  340   Tue Apr 16 16:52:36 2019 KojiOpticsConfigurationOMC(004): B Mirror selectionWe are going to use B6 for the
DCPD BS (BS2), and B1 for the QPD BS (BS3).
Their role can not
 B_Mirror_selection.pdf 
  341   Tue Apr 16 17:24:56 2019 KojiOpticsConfigurationOMC(004): E Mirror selectionWe are going to use E6, E9, E11, and E14
for BS1, SM1, SM2, and SM3. They (and E18)
are all very similar.
 E_Mirror_selection.pdf 
  342   Tue Apr 16 21:16:11 2019 KojiOpticsCharacterizationOMC(004): PZT testing for spare OMCAfter having dug into the past email, it
turned out that these wires were the ones
already replaced from the original teflonwires.
  
  345   Wed Apr 17 10:30:37 2019 PhilipOpticsGeneralOMC optical set-up day 1[Joe, Koji, Liyuan, Philip, Stephen]
Work done on 16.04.2019
  
  346   Thu Apr 18 20:47:54 2019 JoeOptics OMC initial alignment and locking[Joe, Phillip, Koji, Stephen]

*draft post, please add anymore
info if I missed something*
 IMG_7676.JPGIMG_7666.JPGIMG_7670.JPGIMG_7883.JPGIMG_7882.JPG 
  347   Fri Apr 19 09:21:07 2019 PhilipOptics Cleaning of OMC opticsach[Joe, Phillip, Koji,
Stephen]

Work from 17.04.2019
 IMG_7877.JPGIMG_7883.JPGIMG_7884.JPG 
  349   Fri Apr 19 11:34:19 2019 KojiOptics OMC initial alignment and lockingThe spot on CM1 was found displaced by
3.4mm (horiz.) and 3.0mm (vert.)
in the upper right direction looking from
 misalignment1.pdf 
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