 Tue Apr 16 21:16:11 2019, Koji, Optics, Characterization, OMC(004): PZT testing for spare OMC
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After having dug into the past email, it turned out that these wires were the ones already replaced from the original teflonwires. The length of them
were confirmed to be ~19" (480mm).
Quote:
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 Thu May 9 18:10:24 2019, Koji, Optics, Characterization, OMC(004): Spot position scan / power budget 
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(Now the CCD image is captured as a movie and the screen capture is easier!)
Various spot positions on CM1 and CM2 were tried to test how the transmission is dependent on the spot positions. CM1 has a
few bright spots while CM2 shows very dark scattering most of the case. Attachment 1 is the example images of one of the best alignment |
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Sat Apr 20 00:50:12 2019, Koji, Optics, Characterization, OMC(004): Spot positions
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Similarly to OMC ELOG 349 the spot positions after the replacement of CM2 were measured
(Attachment 1)
Also, the spot positions after the realignment were measured. (Attachment 2) |
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Wed May 1 15:40:46 2019, Koji, Optics, Characterization, OMC(004): Spot positions and the scattering
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Tried a few things.
1. Replaced CM1 (PZT ASSY #10=M21+PZT#22+C12) with PZT ASSY #7 (=M1+PZT#13+C13)
We tried PZT ASSY #7 at the beginning and had the spots at almost at the top edge of the curved mirrors. As we found a particle on the bottom |
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Fri May 3 11:06:28 2019, Koji, Optics, Characterization, OMC(004): Spot positions and the scattering
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Experiment on 5/1
- CM1 right knob was moved 1div (10um) backward such that the spots were better centered on the mirrors
FM1 (A5): h=-0.2mm -> 0.4mm made the spot much darker but still it has a few scattering spots. |
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Mon Apr 22 19:54:28 2019, Koji, General, , OMC(004): Spot positions at the end of Apr 22nd
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Wed Apr 17 09:08:47 2019, Stephen, General, General, OMC(004): Unwrapping and preparing breadboard
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[Stephen, Philip, Koji, Joe]
Breadboard D1200105 SN06 was selected as described in eLOG 338. This log describes
unwrapping and preparation of the breadboard. |
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Wed Apr 10 19:22:24 2019, Koji, General, General, OMC(004): preparation for the PZT subassembly bonding
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Preparation for the PZT subassembly bonding (Section 6.2 and 7.3 of T1500060 (aLIGO OMC optical
testing procedure)
- Gluing fixture (Qty 4) |
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Thu Apr 11 10:54:38 2019, Stephen, General, General, OMC(004): preparation for the PZT subassembly bonding
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Quote:
Preparation for the PZT subassembly bonding (Section 6.2 and 7.3 of T1500060
(aLIGO OMC optical testing procedure) |
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Sat Sep 7 17:20:56 2013, Koji, General, General, OMC/PD lab optical table wrapping
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[Koji Jeff]
In order to prepare for the splinkler installation on the HEPA enclosure, the table with the optics was wrapped with Ameristat sheets. |
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Sun Jun 25 21:04:35 2023, Koji, General, Characterization, Optical assembly/testing of OMC (004) completed
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Optical assembly/testing of OMC (004) completed
- OMC (004) with the transport fixture was wrapped and moved to Downs 227 together with the boxes for OMC cabling hardware and DCPD/QPD connector
parts. |
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Fri Aug 16 16:36:19 2013, Koji, Optics, General, Optics List
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Link to the "Mirror/PZT Characterization links"
Breadboard
BB1 OMC(001) OMC |
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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) |
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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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Tue May 16 13:07:11 2023, Stephen, Optics, Characterization, PZT DC Response with Shadow Sensor - DC Response Qualitative Results, Batch 1
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12 May 2023, Downs 227
Stephen, Camille, Thejas
We completed a first batch of PZT DC response measurements, and we are working on the processing of quantitative results. |
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Tue May 2 12:49:43 2023, Stephen, Optics, Characterization, PZT DC Response with Shadow Sensor - First measurement attempt
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[Stephen, Camille, Thejas]
A running log of our efforts from Monday 1 May. Data continues to be placed in T2300050 at sheet "PiezoDCResponse":
Continuing with the DCPD and 3-axis piezo driver for our "final" setup
PD Thorlabs
Driver Thorlabs |
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Thu May 4 11:39:19 2023, Stephen, Optics, Characterization, PZT DC Response with Shadow Sensor - First measurement attempt
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Efforts from Tuesday through Thursday Wednesday, 02 through 04 May, are described below.
The main outcomes were:
We are able to see some response in the frequency domain (which confirms the response that we hear at acoustic drive |
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Fri May 5 18:37:31 2023, Stephen, Optics, Characterization, PZT DC Response with Shadow Sensor - First measurement attempt
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[Thejas, Camille, Stephen]
In Downs 227 on 05 May 2023
We took the following actions: |
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Mon May 1 13:30:40 2023, Stephen, Optics, Characterization, PZT DC Response with Shadow Sensor - PD Calibration
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[Stephen, Camille, Thejas, with support from Luis]
Calibration reattempted with the PD borrowed from Koji, equivalent to the last PZT measurment (OMC_Lab/336).
There were a couple of differences in contrast to the last measurement: |
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Wed Apr 26 13:23:00 2023, Stephen, Optics, Characterization, PZT DC Response with Shadow Sensor - QPD Calibration
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[Stephen, Camille, Thejas, with support from Marie, Dean, Luis]
We setup a shadow sensor! (Attachment 1)
QPD (Thorlabs PDQ80A) and HeNe laser (< 4 mW @ 633 nm, Thorlabs HNLS008R, 12V / .7A) borrowed from Marie.
QPD supplied |
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Mon Jul 17 10:15:56 2023, Camille Makarem, Electronics, Characterization, PZT Reliability Test Results (part 1 of 2) 10x
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[Camille, Thejas, Stephen]
Results for PZT reliability tests:
Batch 1: SN37, SN38, SN39, SN44 |
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Wed Jul 19 08:38:07 2023, Camille Makarem, Electronics, Characterization, PZT Reliability Test Results (part 2 of 2)
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Results for PZT reliability test:
Batch 3: SN31, SN32, SN35, SN40, SN45
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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 Aug 24 16:09:46 2023, Camille Makarem, Optics, General, PZT length-to-angle coupling
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[Camille, Thejas]
We checked the length-to-angle coupling of each PZT by monitoring the position of the transmitted beam on the CCD camera. The CCD camera was placed |
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Fri Jun 2 13:28:09 2023, Camille Makarem, Electronics, , PZT op-lev measurements
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The op-lev setup was modified slightly (picture attached). The He-Ne laser was replaced with one with a lower divergence angle. The stage that the PZT/mirror
stack sits on was replaced with a setup that allows for tip/tilt adjustements. The PZTs were driven from 0 to ~92V at 0.5Hz. The total path length from
the PZT stack to the QPD is ~1.6m. |
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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 |