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Entry  Mon Jul 18 14:20:09 2022, Koji, General, General, OMC #002 Plan Portal 
    Reply  Tue Jul 19 03:17:56 2022, Koji, General, General, OMC #002 Power Budget before mirror cleaning 
       Reply  Thu Jul 21 02:55:06 2022, Koji, General, General, OMC #002 Power Budget after mirror cleaning 
    Reply  Thu Jul 21 14:35:35 2022, Koji, General, General, Bond reinforcement blocks for the invar brackets IMG_1095.JPGIMG_1091.JPG
    Reply  Thu Jul 21 14:55:48 2022, Koji, General, General, Optics bonding for the backscatter measurement IMG_1098.JPG
    Reply  Thu Jul 21 17:47:00 2022, Koji, General, General, The profile of the beam incident on the fiber input coupler fiber_beam_profile.pdf
    Reply  Fri Jul 22 00:31:17 2022, Koji, General, General, OMC #002 backscatter measurement OMC_backscatter.pdf
    Reply  Fri Jul 22 17:47:38 2022, Koji, General, General, C&B request for the reinforcement blocks PXL_20220722_222013127.jpg
    Reply  Tue Jul 26 00:12:58 2022, Koji, General, General, High QE PD: QE measurements IMG_1118.JPG
       Reply  Wed Jul 27 10:34:09 2022, Koji, General, General, High QE PD: QE measurements 2 IMG_1119.JPGIMG_1120.JPG
    Reply  Wed Jul 27 10:09:51 2022, Koji, General, General, 4+4 wire clamp in hand PXL_20220727_072154009.jpg
    Reply  Wed Jul 27 10:34:30 2022, Koji, General, General, OMC #002 Protective FirstContact Paint IMG_1125.JPG
    Reply  Wed Jul 27 23:52:18 2022, Koji, General, General, OMC #002 Cable bracket replacement (1) IMG_1126.JPGIMG_1135.JPGIMG_1127.JPGIMG_1129.JPGIMG_1130.JPG
    Reply  Thu Jul 28 00:28:15 2022, Koji, General, General, OMC #002 Cable bracket replacement (2)  IMG_1132.JPGIMG_1133.JPGIMG_1136.JPG
    Reply  Thu Jul 28 00:46:47 2022, Koji, General, General, Subject: OMC #002 Cable bracket replacement (3) IMG_1137.JPGIMG_1148.JPGIMG_1138.JPG
    Reply  Wed Aug 10 18:42:27 2022, Koji, General, General, OMC #002 Cable bracket replacement (4) PXL_20220809_235457354.jpgPXL_20220811_011910569.jpgPXL_20220811_013746139.jpg
       Reply  Thu Aug 11 15:24:57 2022, Koji, General, General, OMC #002 Cable bracket replacement (5) 
    Reply  Mon Aug 15 21:31:56 2022, Koji, General, General, OMC #002 Cable bracket replacement (6)  IMG_1155.JPGIMG_1149.JPGIMG_1150.JPG
    Reply  Mon Aug 15 22:06:18 2022, Koji, General, General, OMC #002 new cable tie installed IMG_1929.JPGIMG_1930.JPG
    Reply  Mon Aug 15 22:43:35 2022, Koji, General, General, OMC #002 Delamination repair Part1 (1) IMG_1926.JPGPXL_20220816_011346581.jpg
       Reply  Mon Aug 15 22:49:03 2022, Koji, General, General, OMC #002 Delamination repair Part1 (2) 7x
          Reply  Wed Aug 24 02:51:23 2022, Koji, General, General, OMC #002 Delamination repair Part1 (3) 8x
    Reply  Wed Aug 24 02:53:46 2022, Koji, General, General, OMC #002 Delamination repair Part2 (1) IMG_1168.JPGIMG_1169.JPGIMG_1170.JPGIMG_1171.JPGIMG_1175.JPG
       Reply  Wed Aug 24 03:20:59 2022, Koji, General, General, OMC #002 Delamination repair Part2 (2) 11x
          Reply  Wed Aug 24 03:26:43 2022, Koji, General, General, OMC #002 Delamination repair Part2 (3) 8x
    Reply  Wed Aug 24 02:57:43 2022, Koji, General, General, EP30-2 bonding setup IMG_1178.JPGIMG_1179.JPGIMG_1180.JPG
    Reply  Wed Aug 24 11:29:47 2022, Koji, General, General, OMC #002 ready for shipment IMG_1207.JPGPXL_20220825_004259850.jpgPXL_20220825_004307204.jpgPXL_20220825_005423342.jpgPXL_20220825_005549985.jpg
    Reply  Thu Aug 25 14:22:08 2022, Koji, General, General, LLO OMC #001 Ballast Mass investigation DSCN0917.JPGDSCN0922.JPGP6108705.JPGP6108707.JPGP6108706.JPG
       Reply  Thu Aug 25 20:05:00 2022, Koji, General, General, LLO OMC #001 Ballast Mass investigation balance_mass_config_LLO.pdf
    Reply  Fri Aug 26 22:29:02 2022, Koji, General, General, Tool Shipping Prep PXL_20220831_025623318.jpgPXL_20220831_024518032.jpgPXL_20220831_030234581.jpg
Message ID: 427     Entry time: Tue Jul 26 00:12:58 2022     In reply to: 415     Reply to this: 429
Author: Koji 
Type: General 
Category: General 
Subject: High QE PD: QE measurements 

- Installed the High QE PDs to OMC #002

  • B1-22@Cage B1 was installed to the transmission DCPD
  • B1-23@Cage B1 was installed to the reflection DCPD

Upon the installation, the legs of the PDs were cut by 3mm. Also, the tab of the PD could not be embedded in the DCPD housing. Therefore, the tabs were cut.

The alignment looked just fine. The weak reflections are directed to the black glass beam dumps.

- After the installation, the QEs were measured.

  • With Thorlabs S130C power meter, the QE was estimated to be ~95%. (Accuracy +/-7%)
  • With Thorlabs S401C power meter, the QE was estimated to be ~100%. (Accuracy +/-3%)

It is so confusing. So I decided to make the QE test setup.


Ophir RM9 with chopper (+/-5%): 8.97mW
Thorlabs S140C integrating sphere (+/-7%): 9.11mW
Thorlabs S130C PD power meter (+/-7%): 9.15mW
Thorlabs S401C thermal power meter (+/-3%): 8.90mW
So there looks ~3% discrepancy between S130C and S401C

Then tried to measure the QE of C1-03@Cage B3 with Ophir RM9
- Initial state: QE=0.95
- First FirstContact application: QE went up to 0.973
- Second FirstContact application: QE = 0.974, basically no change


To Do:
- Calibrate the trans-impedance amp with Keithley
- Apply FC to B1-22 and B1-23 to see if there is an improvement
- The power should be measured with S401C because the accuracy seems better (+/-3%).
- Take photos of the PD FC process

General To Do:

- Backscatter test 2nd trial

- Start applying the first contact to the optical surfaces
- Beam dump cleaning
- Apply FC cap to the PDs
- Delamination repair (light side)
- Delamination repair (dark side)
- Cable bracket replace (dark side)

 

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