 Thu Jul 13 01:02:58 2023, Stephen, Optics, General, A+ OMC, Bonding of Curved Mirror Batch 1 16x
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[2023.07.13 - Stephen, Camille, Thejas, Maria]
We bonded Curved Mirror assemblies today. Some notes about this log entry:
Thejas will post a log discussing matching.
This log hosts a subset of the photos posted to the A+ |
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Thu Aug 3 15:04:26 2023, Stephen, General, General, aLIGO Unit 4 Build, Cable Routing, Preparation
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[Dean, Stephen]
Unit #4 aLIGO OMC unit was transported to the 40m Bake Lab.
We unwrapped the Transport Fixture and identified the orientation which would place the Light Side up and accessible. We removed the 4 long SHCS |
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Mon Jul 2 15:27:31 2018, Rich Abbott, Electronics, General, Work on EOM (3rd IFO unit)
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Koji, Rich
We took apart the unit removed from the 3rd IFO (Unit serial number aLIGO #3, XTAL 10252004) to see what makes it tick. Koji has done a
fine job of adding the plots of the impedance data to this log book. Attached are some details of the physical construction showing the capacitor |
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Tue Jul 3 12:07:47 2018, Rich Abbott, Electronics, Characterization, Notes on 3rd IFO EOM
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| Attached please see my notes summarizing the models for the electrodes and inductors within the 3rd IFO EOM |
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Wed Aug 8 17:32:56 2018, Rich Abbott, General, Characterization, Modulation Index Test Setup at 40m Lab
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| Attached is a block diagram of the test setup used in the 40m lab to measure the modulation index of the IO modulator |
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Mon Apr 15 21:11:49 2019, Philip, Optics, Characterization, OMC(004): PZT testing for spare OMC
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[Koji, Philip]
Today we tested the functionality of the four remaining PZTs (11,12,13 and 22) . Each PZT was placed within a collimated 500um beam.
Roughly half of the beam was blocked by the PZT. The PZT and a PD then acted as shadow sensor. Each PZT was tested with 0 and |
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Wed Apr 17 10:30:37 2019, Philip, Optics, General, OMC optical set-up day 1
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[Joe, Koji, Liyuan, Philip, Stephen]
Work done on 16.04.2019
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Fri Apr 19 09:21:07 2019, Philip, Optics, , Cleaning of OMC optics
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ach[Joe, Phillip, Koji, Stephen]
Work from 17.04.2019
First contact cleaning of OMC optics |
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Tue Apr 18 07:59:46 2023, Madeline Lesovsky, General, General, Test Cure Bake - Curved Mirror Subassembly Bonding 6x
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This is a test bake conducted in Air Bake Oven A (ABO-A) held in the 40m Clean and Bake facility. The overall objective is to sucessfully cure the Curved
Mirror Subassemblies with the appropriate temperature profile. In this test run, we wanted to ensure that the temperature profile dictated via the Platinum
software is stable and repeatable. |
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Wed Jul 26 15:01:26 2023, Madeline Lesovsky, Optics, General, Subassembly Bonding Effort - Oven Bake Profile Results
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The bonding efforts were conducted on Thursday, July 13, 2023 (https://nodus.ligo.caltech.edu:8081/OMC_Lab/561)
The duration of the air bake in ABO A was recorded and results can be found in the graphs below. The raw data can be found in the .xlsx file.
Post-bake log (https://nodus.ligo.caltech.edu:8081/OMC_Lab/563) for reference. |
 Tue Mar 14 12:12:41 2023, Koji , Optics, Characterization, A+ OMC curved mirror characterization
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RoC: 2.65m ! Interesting. I'll wait for the follow-up analysis/measurements. The RoC may be dependent on the area (diameter) for the fitting. You
might want to run the fitting of your own. If so, let me know. I have some Matlab code that is compatible with the CSV file exported from MetroPro data. |
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Tue Mar 14 20:06:03 2023, Koji , Optics, Characterization, A+ OMC Curved mirror radius of curvature
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If the mirror has the RoC, it works as a lens. And you should be able to see the effect in the beam profile.
Just what you need to do is to compare the beam profile without the mirror (or with a flat mirror) and then with the curved mirror.
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Wed Mar 15 17:07:35 2023, Koji , Optics, Characterization, A+ OMC Curved mirror radius of curvature
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| I hope you can find useful lenses from the lens kit in the cabinet. If you need more lenses and mounts, talk to our students in WB and the 40m. |
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Fri Mar 17 15:01:21 2023, Koji , Optics, Characterization, A+ OMC Curved mirror radius of curvature
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Thanks Koji, the lenses available in the cabinet in the lab actually sufficed.
Quote:
I hope you can find useful |
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Mon Jul 10 20:29:05 2023, Koji , General, Characterization, OMC(004) PZT characterization
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Belated entry: OMC(004) PZT Slow scan / freq response measurements (May 10/11/17, 2023)
PZT DC scan measurement showed that CM1 had a significantly larger response than the usual PZT responses, and CM2 has the one significantly less.
The measurements were repeated and the same result was confirmed. |
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Fri Jul 21 03:29:30 2023, Koji , Optics, General, A+ OMC optic bench beam layout
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Nice measurement. This result suggests that the fiber mode is supposed to be matched to the OMC cavity by 99.8% at z0=0.358 m. Note that the OMCmode
has a waist radius of 0.4896 mm and 0.4905 mm for the horizontal and vertical modes, respectively.
In reality, the fiber mode contains higher-order HG modes. Therefore the actual mode matching will be limited to ~98%. |
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Fri Jun 15 15:45:49 2012, Koji, General, General, OMC Plan
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LIGO Document G1200683-v1:
aLIGO OMC fabrication and testing plan
aLIGO OMC wiki |
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Sat Jun 16 08:53:09 2012, Koji, General, General, To Do List
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Facility
Work
Replacing wooden work benches
W60" x H28-34" x D30" |
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Wed Jun 20 00:10:53 2012, Koji, Facility, General, Hole on the wall was patched
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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 Jul 18 23:20:13 2012, Koji, Optics, Characterization, Mode scan results of ELIGO
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Nic Smith sent me a bunch of elog lists where the results of the mode scan can be found.
From Nic:
There have been many mode scan analyses done at LLO: |
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Mon Jul 23 17:15:14 2012, Koji, Clean, General, Talking with Margot
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I consulted with Margot about the cleaning of the optics
Optics are considered as a clean object. Large dusts can be removed by ionized N2 flow etc.
Barrel of optics can be wiped
with Acetone.
Optical surfaces are best to be cleaned by First Contact.
A peek |
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Tue Jul 24 11:41:29 2012, Koji, General, General, Useful references
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Nicolas Smith,
LIGO Document T0900383-v1
3mm Photodiode Characterization for Enhanced LIGO |
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Tue Jul 31 21:29:43 2012, Koji, General, General, Work completed in July [!]
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Completed Work: Facility/Supplies
Plug a big hole on the wall [ELOG]
Purchasing work benches |
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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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Wed Aug 1 19:35:00 2012, Koji, Facility, General, Floor cleaned / Workbench being built / Table top defect
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- The floor of the room was cleaned and waxed!
- Sticky mats are placed! Now we require shoe covers!
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Sat Aug 11 00:59:14 2012, Koji, Facility, General, Laser Safety Barrier
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It seemed that a laser safety barrier was installed today!?
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Mon Aug 13 16:59:11 2012, Koji, Clean, General, Room Cleaning Log
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Floor wiped with a wet wiper (Aug 13, 2012)
Floor wiped with a wet wiper (Aug 15, 2012)
Floor wiped with a wet wiper (Sep 25, 2012) |
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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 Aug 14 03:29:06 2012, Koji, Supply, General, Clean supply rack
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Clean supplies & some cleaning tools are located at the right side of the entrance.
The file cabinet there was moved to the left side of the door, but will be removed eventually.
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Wed Aug 22 20:16:43 2012, Koji, Facility, General, Workbenches have been installed / Clean room stools
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Last Friday, new workbenches were installed. Vladimir got a new table and a cleanroom stool.
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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 5 03:39:58 2012, Koji, Optics, General, RoC Test setup
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Based on Zach's experiment design, I wrote up a bit more detailed optical layout for the mirror test.
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Mon Oct 8 11:30:47 2012, Koji, Optics, General, EG&G 2mm photodiode angle response
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| EGE&G 2mm photodiode angle response measured by Sam T1100564-v1 |
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Tue Oct 9 04:59:24 2012, Koji, Optics, General, OMC Test Optical Setup
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Tue Oct 9 05:03:15 2012, Koji, Electronics, General, OMC Test Electronics Setup
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Fri Oct 12 17:15:19 2012, Koji, Optics, General, Loan from the 40m / ATF
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HWP set
Optics: CVI QWPO-1064-08-2-R10
Mount: New Focus #9401
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Tue Oct 16 15:50:09 2012, Koji, General, General, Work completed in August/September [!]
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Work done
Floor cleaning
[ELOG]
Placing sticky
mats [ELOG]
Label Maker |
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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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Wed Oct 17 20:36:04 2012, Koji, Optics, General, RoC test cavity locked
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The RoC test setup has been built on the optical table at ATF.
The cavity formed by actual OMC mirrors have been locked. |
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Thu Oct 18 20:23:33 2012, Koji, Optics, Characterization, Improved measurement
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Significant improvement has been achieved in the RoC measurement.
The trans PD has much more power as the BS at the cavity trans was replaced by a 50% BS. This covers the disadvantage of using the a
Si PD.
The BB EOM has a 50Ohm terminator to ensure the 50Ohm termination at Low freq.
The length of the cavity was changed |
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Wed Nov 7 01:28:20 2012, Koji, Optics, Characterization, Wedge angle test (A1)
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Wedge angle test
Result: Wedge angle of Prism A1: 0.497 deg +/- 0.004 deg
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Wed Nov 7 20:21:42 2012, Koji, General, General, Work completed in October [!]
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Completed work of the previous months: [Jul] [Aug]
[Sep] [Oct] [Nov]
[Dec] |
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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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Thu Nov 8 13:24:53 2012, Koji, Optics, Characterization, More wedge measurement
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A1
Horiz Wedge 0.497 +/- 0.004 deg
Vert Wedge 0.024 +/- 0.004 deg |
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Thu Nov 8 19:47:55 2012, Koji, Electronics, Configuration, Solder for PZTs
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Rich saids:
I have ordered a small roll of solder for the OMC piezos.
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Thu Nov 8 19:52:57 2012, Koji, Optics, General, How to apply UV epoxy
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KA's question:
Do you know how to apply this epoxy?
Do we need a plunger and a needle for this purpose? |
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Thu Nov 8 20:12:10 2012, Koji, Optics, Configuration, How many glass components we need for a plate
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Optical prisms 50pcs (A14+B12+C6+E18)
Curved Mirrors 25pcs (C13+D12)
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Fri Nov 9 00:43:32 2012, Koji, Optics, Characterization, Further more wedge measurement
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Now it's enough for the first OMC (or even second one too).
Today's measurements all distributed in theta>0.5deg. Is this some systematic effect???
I should check some of the compeled mirrors again to see the reproducibility... |