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ID Date Author Type Categorydown Subject Text Attachments
  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 
  298   Mon Jul 2 11:30:22 2018 KojiElectronicsCharacterization3IFO EOM impedance measurement[Rich Koji]

3IFO EOM (before any modification)
was tested to measure the impedance of each
 impedance_eom.pdfEOM_Z_DATA.zip 
  299   Mon Jul 2 12:29:01 2018 KojiElectronicsCharacterizationImpedances of individual components (3IFO EOM)[Rich Koji]

The impedances of the individual
components from the 3IFO EOM (before modification)
 impedance_coils.pdfimpedance_xtals.pdfq_coils.pdfcomponent_models.pdfliso_models.zip 
  301   Tue Jul 3 12:07:47 2018 Rich AbbottElectronicsCharacterizationNotes on 3rd IFO EOMAttached please see my notes summarizing
the models for the electrodes and inductors
within the 3rd IFO EOM
 EOM_Analysis2.pdf 
  302   Wed Jul 4 18:30:51 2018 KojiElectronicsCharacterizationEOM circuit modelsThe circuit models for the 3IFO EOM (before
mods) were made using LISO.
Then the modification plan was made
 eom_models.pdfeom9.pdfeom24.pdfeom45.pdf180704_3IFO_EOM_model.zip 
  303   Thu Jul 26 20:57:07 2018 KojiElectronicsCharacterization9MHz port tuned impedance[Rich Koji]

The 9MHz port was tuned and the
impedance was measured.
 impedance_eom.pdfeom9.pdfeom_models_9MHz.pdf 
  304   Tue Aug 7 15:43:12 2018 KojiElectronicsCharacterizationNew LLO EOM stuffed[Rich, Dean, Koji]

Stuffed all inductors for the new
LLO EOM. As the impedances were sensitive
 P_20180806_154457.jpgimpedance_eom.pdfimpedance_eom_zoom.pdf 
  305   Wed Aug 8 17:32:56 2018 Rich AbbottGeneralCharacterizationModulation Index Test Setup at 40m LabAttached is a block diagram of the test
setup used in the 40m lab to measure the
modulation index of the IO modulator
 40mLabModIndexSetup.pdf 
  306   Thu Aug 9 11:24:29 2018 KojiGeneralCharacterizationModulation Index Test Setup at 40m Lab[Rich Koji]

The impedances of the new LLO EOM
were measured with the beat note setup at
 modulation_depth.pdfmodulation_depth_zoom.pdf 
  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 
  319   Tue Mar 19 17:30:25 2019 KojiGeneralCharacterizationOMC (002) Test itemsOMC #002 Optical tests


FSR
measurement (done, 2019/1/8-9, 2019/4/1)
  
  320   Thu Mar 28 16:36:52 2019 KojiMechanicsCharacterizationOMC(002) PZT characterization As
performed in the ELOG 202, the PZTs of
the OMC 002 were tested.
 PZT_Scan.pdfOMC_PZT_Response.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 
  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.
  
  350   Sat Apr 20 00:50:12 2019 KojiOpticsCharacterizationOMC(004): Spot positionsSimilarly to OMC
ELOG 349 the spot positions after the
replacement of CM2 were measured (Attachment
 misalignment2.pdfmisalignment3.pdf 
  354   Wed Apr 24 13:58:51 2019 JoeOpticsCharacterizationOMC power budget and UV Epoxy Bonding of BS1[koji,philip,joe,liyuan,stephen]

need to add spot positions.

Mirrors: PZT11,PZT22, A14, A5
  
  355   Thu Apr 25 15:05:19 2019 JoeOpticsCharacterizationLooking at PZT HOM spacing dependance and thinking about workflow[koji, joe]

The template or glass breadboard
was wobbling, and we noticed that the caivty
  
  356   Wed May 1 15:40:46 2019 KojiOpticsCharacterizationOMC(004): Spot positions and the scatteringTried a few things.

1. Replaced CM1 (PZT ASSY
#10=M21+PZT#22+C12) with PZT ASSY #7 (=M1+PZT#13+C13)
 misalignment.pdf 
  357   Fri May 3 11:06:28 2019 KojiOpticsCharacterizationOMC(004): Spot positions and the scatteringExperiment on 5/1
- CM1 right knob was moved 1div (10um)
backward such that the spots were better
 misalignment.pdf 
  360   Thu May 9 18:10:24 2019 KojiOpticsCharacterizationOMC(004): Spot position scan / power budget(Now the CCD image is captured as a movie
and the screen capture is easier!)

Various spot positions
 190508.pngscattering_spots_CM1.png 
  365   Thu May 23 01:42:46 2019 KojiOpticsCharacterizationC30665 high power testAn Excelitas C30665 PD with the
cap removed (SN07 in Case H slot #2) was
exposed to the beam with the optical power
 C30665_high_power_test.pdfpd_surface.jpg 
  366   Thu May 23 23:27:38 2019 KojiOpticsCharacterizationIGHQEX3000 high power testLaserComponents IGHQEX3000 (Cage
B2: Serial# B1-23) was exposed to the beam
with the optical power from 1.6mW to 332mW.
 HQEPD_high_power_test.pdfpd_images.png 
  369   Mon Jul 1 12:38:49 2019 KojiOpticsCharacterizationA and M prisms perpendicularity measurement[Stephen, Koji]

The perpendicularity of
some of the A and M prisms were tested.
 6x 
  370   Mon Jul 1 12:49:42 2019 KojiOpticsCharacterizationScattering measurement of A and C mirrorsLiyuan's scattering measurement for
the A and C mirrors.
 omc_cm_tis_062419.pdfomc_prism_tis_062419.pdf 
  371   Thu Aug 22 12:35:53 2019 StephenOpticsCharacterizationWedging of the debonded PZTs 2019 AugustWedge and thickness measurements of PZTs
12 and 13 took place after debonding and
cleaning - results are shown in the first
 IMG_4775.JPGIMG_4770.JPG 
  372   Fri Aug 23 11:11:44 2019 shrutiOpticsCharacterizationFinding the curvature bottomI attempted to fit the data taken
by Koji of the beam spot precession at the
CCD in order to find the location of the
 CircleFit.pdfSineFit.pdf 
  373   Thu Aug 29 11:51:49 2019 shrutiOpticsCharacterizationWedging of the debonded PZTs - CalculationUsing the measurements of PZTs 12,13 taken
by Stephen, I estimated the wedging angle
and orientation following Section 2.3.1 of
 PZT_Wedging_Results.pdfPZT_Wedging_Calc.pdf 
  395   Thu Oct 8 19:55:22 2020 KojiGeneralCharacterizationPower Measurement of Mephisto 800NE 1166AThe output of Mephisto 800NE (former TNI
laser) was measured.
The output power was measured with
 Mephisto800NE_1166A.pdf 
  402   Sat Nov 21 13:58:30 2020 KojiElectronicsCharacterizationDark Current Measurement for InGaAs QPDsDark current measurement for InGaAs QPDs
(OSI FCI-InGaAs-Q3000) has been done using
Keithley 2450 and Frank's diode test
 Q3000_dark_current.pdf 
  403   Sun Nov 22 13:49:12 2020 KojiElectronicsCharacterizationImpedance Measurement for InGaAs QPDsTo know any anomaly to the junction
capacitance of the QPD segments, the RF impedances
were tested with a hand-made impedance measurement.
 impedance_measurement.pdfP_20201121_183830.jpgimpedance_test.pdfQ3000_impedance_test.pdf 
  404   Mon Nov 23 23:17:19 2020 KojiElectronicsCharacterizationThe dark noise of the Q3000 QPDsThe dark noise levels of the four Q3000
QPDs were measured with FEMTO DLPCA200 low
noise transimpedance amp.
 Q3000_dark_noise_81.pdfQ3000_dark_noise_82.pdfQ3000_dark_noise_83.pdfQ3000_dark_noise_84.pdf 
  405   Tue Nov 24 10:45:07 2020 gautamElectronicsCharacterizationThe dark noise of the Q3000 QPDsI see that these measurements are done
out to 100 kHz - I guess there is no reason
to suspect anything at 55 MHz which is where
  
  406   Tue Nov 24 12:27:18 2020 KojiElectronicsCharacterizationThe dark noise of the Q3000 QPDsThe amplifier BW was 400kHz at the gain
of 1e7 V/A. And the max BW is 500kHz even
at a lower gain. I have to setup something
  
  224   Wed Jul 15 22:23:17 2015 KojiElectronicsAM Stabilized EOM DriverE1400445 first lookThis is not an OMC related and even not
happening in the OMC lab (happening at the
40m), but I needed somewhere to elog...
 IMG_20150714_195534852.jpgIMG_20150714_195227746_HDR.jpg 
  225   Sat Jul 18 11:37:21 2015 KojiElectronicsAM Stabilized EOM DriverD0900848 power board ~ oscillation issue solvedPower Supply Board D0900848 was
oscillating. Here is the procedure how the
issue was fixed.
 6x 
  227   Wed Jul 22 09:43:01 2015 KojiElectronicsAM Stabilized EOM DriverPower supply test of the EOM/AOM DriverSerial Number of the unit: S1500117
Tester: Koji Arai
  
  228   Wed Jul 22 10:15:14 2015 KojiElectronicsAM Stabilized EOM DriverRF test of the EOM/AOM Driver S15001177) Make sure the on/off RF button works,
=> OK

8) Make sure the power output doesn't
  
  229   Sat Jul 25 17:24:11 2015 KojiElectronicsAM Stabilized EOM DriverRF test of the EOM/AOM Driver S1500117(Calibration for Attachment 5 corrected
Aug 27, 2015)


Now the test procedure
 7x 
  230   Tue Jul 28 18:36:50 2015 KojiElectronicsAM Stabilized EOM DriverRF test of the EOM/AOM Driver S1500117Final Test Result of S1500117:
https://dcc.ligo.org/LIGO-S1500117


After some staring the
 IMG_20150727_214536773_HDR.jpgEOM_Driver_DAQ_TF_test.pdfEOM_Driver_Mon_PSD.pdf 
  231   Mon Aug 10 02:11:47 2015 KojiElectronicsAM Stabilized EOM DriverRF AM Measurement Unit E1500151This is an entry for the work on Aug 3rd.

LIGO
DCC E1500151
 IMG_20150803_223403975.jpgIMG_20150803_221210816_HDR.jpgIMG_20150803_223420267.jpg 
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