 Thu Jul 21 14:55:48 2022, Koji, General, General, Optics bonding for the backscatter measurement 
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The backscatter beam is supposed to appear in the backpropagation path. The transmission of the OMC has a couple of optics, it's not easy to access
that beam.
To try to deflect the beam either horizontally or vertically, small optical pieces were made. (Attachment) |
 Tue Sep 8 11:18:10 2015, Koji, Optics, Characterization, PBS Transmission measurement
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Motivation: Characterize the loss of the Calcite Brewster PBS.
Setup: (Attachment 1)
- The beam polarization is rotated by an HWP |
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Wed Sep 9 01:58:34 2015, Koji, Optics, Characterization, PBS Transmission measurement
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Calcite Brewster PBS Continued
The transmission loss of the Calcite brewster PBS (eLIGO squeezer OFI) was measured with different conditions.
The measured loss was 3600+/-200ppm. (i.e. 900+/-50 ppm per surface) |
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Wed Oct 16 19:16:29 2013, Koji, Optics, Characterization, PD alignment
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shim 1.5mm 001/002 |
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Tue Sep 20 08:54:33 2022, Koji, General, General, PD cage arrangement
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Upon the LLO work, the current PD arrangement in the cages are:
CAGE B
B1 OMC1 PDT (A1-23) |
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Sun Mar 6 02:13:28 2016, Koji, Optics, Characterization, PD glass reflections
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On friday, I removed a glass cover of a G30655 with a PD can cutter.
When a beam shoots a Perkin Elmer/Excelitas PD, we usually observe three reflections.
We always wonder what these are. |
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Wed Oct 23 02:45:07 2013, Koji, General, General, PD realignment
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DCPD2 got misaligned during the cable installation. The PD alignment procedure have been gone through again.
Cavity locking
- Removed the FC layers for the cavity related mirrors. |
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Tue Apr 16 00:40:45 2013, Koji, Optics, General, PD/QPD path gluing ~ preparation
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[Jeff Koji]
- Placed the optics on the PD/QPD path
- Checked the alignment of the beam on the dummy PD/QPD mounts |
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Tue Mar 28 21:04:27 2017, Koji, Electronics, Characterization, PDH amp 6x
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Attachment 1: PDH amp RF part (before the preamp was installed)
Attachment 2: RF-AF transmission
Attachment 3: Attachment 3: LO dependence |
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Sat Jul 29 18:44:38 2017, rana, Electronics, Characterization, PDH amp
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| attachment 6: DCPD preamp looks like the opamp is wired for positive feedback? |
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Sat Jul 29 21:42:51 2017, Koji, Electronics, Characterization, PDH amp
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| The polarities indicated in the right circuits were opposite, obviously. |
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Sat Jan 12 22:49:11 2019, Koji, Optics, Characterization, PM-SM patch cable mode cleaning effect
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Mode cleaning capability of an optical fiber was measured. The conclusion is that the
leakage of the non-fiber mode to the fiber output is insignificant and also practically negligible.
The tested fiber was Thorlabs 5-m Polarization Maintaining Single-Mode fiber (P3-1064PM-FC-5, PM Patch Cable, PANDA, 1064 nm, FC/APC, 5m). |
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Mon Apr 8 20:56:52 2013, Koji, Optics, Configuration, PZT & Curverd Mirror arrangement
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Assembly #1:
Mounting Prism #16
PZT #26 |
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Fri Aug 9 10:09:56 2013, Koji, General, General, PZT Assembly #3/#4
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Yesterday, Jeff and I bonded the PZT assemblies (#3/#4).
The attached is the arrangement of the components |
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Mon Aug 12 20:22:19 2013, Koji, General, General, PZT Assembly #5/#6
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PZT Assembly #5/#6 were glued on Fri Aug 9th
They are removed from the fixture on Mon Aug 12th.
All of the four PZT assemblies were moved to the OMC lab. |
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Sat Jul 6 17:10:07 2013, Koji, Mechanics, Characterization, PZT Response analysis
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Analysis of the PZT scan / TF data taken on May 31st and Jun 1st.
[DC scan]
Each PZT was shaken with 10Vpp 1Hz triangular voltage to the thorlabs amp. |
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Thu Sep 5 15:40:42 2019, shruti, Optics, Configuration, PZT Sub-Assembly
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Aim: To find the combinations of mounting prism+PZT+curved mirror to build two PZT sub-assemblies that best minimises the total vertical beam
deviation.
(In short, attachment 1 shows the two chosen sets of components and the configuration according which they must be bonded
to minimize the total vertical angular deviation.) |
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Mon Apr 8 11:49:18 2013, Koji, Mechanics, Characterization, PZT actuator tested at LLO
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Test result of the PZTs by Valera and Ryan
PZT Length Angle
# [nm/V] [urad/um]
11 14.5 17.6
12 13.8 17.8
13 11.2 25.0
14 14.5 6.6
15 12.5 10.6
21 14.5 9.7
22 13.8 28.8
23 14.5 6.8 ==> Assembly #2
24 18.5 51.7 ==> Used for prototyping
25 17.1 13.8
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Mon Apr 8 21:11:14 2013, Koji, Optics, General, PZT assembly gluing
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[Jeff, Zach, Koji]
PZT assembly gluing
Glue gun -> to be returned to MIT |
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Tue Apr 9 13:56:09 2013, Koji, Optics, General, PZT assembly post gluing / pre baking pictures
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Sat Mar 23 13:34:14 2013, Koji, Optics, General, PZT assembly prototype glued
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Prototype PZT assembly
Motivation: |
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Tue Jul 8 18:54:54 2014, Koji, Mechanics, Characterization, PZT characterization
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Each PZT was swept with 0-150V 11Hz triangular wave.
Time series data for 0.2sec was recorded for each PZT.
The swept voltage at the resonances were extracted and the fringe number was counted. |
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Fri Feb 1 12:52:12 2019, Koji, Mechanics, General, PZT deformation simulation
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A simple COMSOL simulation was run to see how the PZT deforms as the voltage applied.
Use the geometry of the ring PZT which is used in the OMCs - NAC2124 (OD 15mm, ID 9mm, H 2mm)
The material is PZT-5H (https://bostonpiezooptics.com/ceramic-materials-pzt) which |
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Thu Aug 22 15:40:15 2013, Koji, Electronics, Configuration, PZT endurance test
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[Koji, Jeff]
Background
In response to the failure of one of the PZTs on L1OMC (LLO:8366), we |
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Fri Aug 23 19:24:32 2013, Koji, Electronics, Configuration, PZT endurance test (II)
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The PZT tests were finished with the conclusion that the PZT won't be damaged with our expected usage.
This is another test of the PZTs to make sure small (~10V) reverse voltage does not break the PZTs.
Background |
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Thu Apr 11 12:15:31 2019, Koji, Mechanics, Configuration, PZT sub assy mirror orientations
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Thu Jan 10 20:45:00 2019, Koji, Optics, Characterization, PZT test cable
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As OMC SN002 already has the PZTs connected to the Mighty-Mouse connector, a test cable with a female mighty-mouse connector was made.
A small imperfection: When the cable was inserted to the connector shell, I forgot to mirror the pin out. Therefore the color and pin number
do not match. |
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Thu Jul 10 01:39:38 2014, Koji, Electronics, General, PZT wire
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Rich came to the OMC lab. Pins for the mighty mouse connector were crimped on the 4 PZT wires.
We found the male 4pin mighty mouse connector in the C&B area.
The cable inventory was checked with ICS/DCC combo. It turned out that most of the on-board cables |
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Thu Jun 21 03:07:27 2012, Zach, Optics, Configuration, Parameter selection / mode definition
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EDIT 2 (ZK): As with the previous post, all plots and calculations
here are done with my MATLAB cavity modeling utility, |
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Mon Aug 13 17:01:35 2012, Koji, Clean, General, Particle Counts
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Aug 13, 2012 / 0.5um 1000~2000/(0.1 cu ft) / 0.7um 400-600/(0.1 cu ft) by ATF particle counter (MET ONE 227A)
They are counts/(0.1 ft^3)! These numbers should be multiplied by 10 to know the particle "CLASS". |
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Tue Sep 25 14:18:14 2012, Koji, Clean, General, Particle Counts
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Particle counts
Before the prefilter is installed: 0.5um 1191cnts, 0.7um 346cnts
2:20 prefilter installed |
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Mon Oct 1 16:06:55 2012, Koji, Clean, General, Particle Counts
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1. It turned out that the particle counter MET ONE 227A at ATF shows
(particle count)/(0.1 ft^3)
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Fri Oct 23 19:09:54 2020, Koji, General, General, Particle counter transfered to Radhika
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| See this entry: https://nodus.ligo.caltech.edu:8081/40m/15642 |
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Thu Feb 21 18:44:18 2013, Koji, Optics, Configuration, Perpendicularity test
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Perpendicularity test of the mounting prisms:
The perpendicularity of the prism pieces were measured with an autocollimator.
Two orthogonally jointed surfaces forms a part of a corner cube. |
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Tue Dec 15 13:39:13 2015, Koji, Electronics, Characterization, Phase noise measurement of aLIGO EOM drivers
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This measurement has been done on Dec 1st, 2015.
The phase noise added by the EOM driver was tested.
The test setup is depicted in the attached PDF. The phase of the RF detector was set so that the output is close to zero crossing as much as |
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Tue Jul 31 21:33:17 2012, Koji, General, General, Plan Update: August [!]
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Completed work of the previous months: [Jul] [Aug] [Sep] [Oct] [Nov] [Dec]
Facility/Supplies
Work done
Floor |
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Sat Jul 14 02:16:07 2012, Koji, General, General, Plan Update: July
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Facility/Supplies
Work in progress
Floor cleaning
Plug slits on the roof of the HEPA booth - blanking panels have been ordered |
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Wed Nov 7 20:44:11 2012, Koji, General, General, Plan Update: November [!]
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Completed work of the previous months: [Jul] [Aug]
[Sep] [Oct] [Nov]
[Dec] |
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Tue Oct 16 15:51:01 2012, Koji, General, General, Plan Update: October [!]
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Completed work of the previous months: [Jul] [Aug]
[Sep] [Oct] [Nov] [Dec]
Facility/Supplies |
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Mon Jun 3 21:19:03 2013, Koji, General, General, Planning
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Monday - Evening
(Koji)
[done] - DCPD alignment |
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Thu Oct 8 19:55:22 2020, Koji, General, Characterization, Power Measurement of Mephisto 800NE 1166A
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The output of Mephisto 800NE (former TNI laser) was measured.
The output power was measured with Thorlabs sensors (S401C and S144C). The reference output record on the chassis says the output was 837mW at 2.1A
injection. |
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Wed Jul 22 09:43:01 2015, Koji, Electronics, AM Stabilized EOM Driver, Power supply test of the EOM/AOM Driver
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Serial Number of the unit: S1500117
Tester: Koji Arai
Test Date: Jul 22, 2015 |
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Fri Nov 6 18:38:00 2020, Koji, General, General, Powermeter lent from OMC Lab to 2um ECDL
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Thorlabs' powermeter controler + S401C head was lent from OMC Lab. Returned to OMC Jul 15, 2022 KA
https://nodus.ligo.caltech.edu:8081/SUS_Lab/1856 |
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Thu Nov 30 12:18:41 2017, Stephen, General, General, Preparation for Modal Testing on 4 December
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Norna Robertson, Stephen Appert || 29 Nov 2017, 2 pm to 4 pm || 227 Downs, CIT
We made some preparations for modal testing, but did not have enough time to make measurements. Below is an after-the-fact log, including some
observations and photos of the current state of the OMC bench. |
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Fri Sep 8 15:14:05 2017, Koji, Facility, General, Preparation for the plumbing work 7x
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[Steve, Aaron, Koji]
We've finished the preparation for the forthcoming plumbing work on (nominally) Sept 16th Saturday.
We've covered most of the west side of the OMC lab with plastic sheets and wraps. |
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Mon Aug 15 10:09:10 2016, Koji, General, General, Prev H1 OMC shipped to CIT
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Previous H1 OMC shipped from LHO to CIT
https://ics-redux.ligo-la.caltech.edu/JIRA/browse/Shipment-8196 |
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Tue Dec 18 20:04:40 2012, Koji, Optics, Characterization, Prism Thickness Measurement
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The thicknesses of the prism mirrors (A1-A5) were measured with micrometer thickness gauge.
Since the thickness of the thinner side (side1) depends on the depth used for the measurement,
it is not accurate. Unit in mm. |
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Thu Jan 19 20:57:53 2017, Koji, Supply, General, Purchase
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Ordered:
Office Depot
v AA battery Qty. 24 |
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Thu Feb 16 17:23:12 2017, Koji, Supply, General, Purchase
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BNC Patch Panel
8x Amphenol Connex 112443 / Isolated BNC FEMALE TO FEMALE BULKHEAD ISOLATED ADAPTER - 50 ohm
http://www.newark.com/amphenol-rf/112443/bulkhead-adapter-bnc-jack-bnc/dp/99H4399
Hole
Diameter: 13mm (0.512") D width 12.10mm (0.477")
4x Amphenol RF 31-4803-75 (75Ohm)
http://www.newark.com/amphenol-rf/31-4803-75/bulkhead-adapter-bnc-jack-bnc/dp/50B8959
same |
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Thu Apr 4 20:07:39 2019, Koji, Supply, General, Purchase
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== Office Depot ==
Really Useful Box 9L x 6 (delivered)
Really Useful Box 17L x 5 (ordered 4/4) |