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Entry  Tue Sep 8 11:18:10 2015, Koji, Optics, Characterization, PBS Transmission measurement setup.JPGCaF2Prism.jpgCaF2Prism2.JPG
Motivation: Characterize the loss of the Calcite Brewster PBS.

Setup: (Attachment 1)

- The beam polarization is rotated by an HWP
    Reply  Wed Sep 9 01:58:34 2015, Koji, Optics, Characterization, PBS Transmission measurement 
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)
    Reply  Wed Oct 16 19:16:29 2013, Koji, Optics, Characterization, PD alignment 
 
 shim 1.5mm 001/002
Entry  Tue Sep 20 08:54:33 2022, Koji, General, General, PD cage arrangement 
Upon the LLO work, the current PD arrangement in the cages are:
CAGE B
B1 OMC1 PDT (A1-23)
Entry  Sun Mar 6 02:13:28 2016, Koji, Optics, Characterization, PD glass reflections P3048124.JPGP3048125.JPG
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.
Entry  Wed Oct 23 02:45:07 2013, Koji, General, General, PD realignment 
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.
Entry  Tue Apr 16 00:40:45 2013, Koji, Optics, General, PD/QPD path gluing ~ preparation 
[Jeff Koji]
- Placed the optics on the PD/QPD path
- Checked the alignment of the beam on the dummy PD/QPD mounts
Entry  Tue Mar 28 21:04:27 2017, Koji, Electronics, Characterization, PDH amp 6x
Attachment 1: PDH amp RF part (before the preamp was installed)

Attachment 2: RF-AF transmission

Attachment 3: Attachment 3: LO dependence
    Reply  Sat Jul 29 18:44:38 2017, rana, Electronics, Characterization, PDH amp 
attachment 6: DCPD preamp looks like the opamp is wired for positive feedback?
    Reply  Sat Jul 29 21:42:51 2017, Koji, Electronics, Characterization, PDH amp 
The polarities indicated in the right circuits were opposite, obviously.
Entry  Sat Jan 12 22:49:11 2019, Koji, Optics, Characterization, PM-SM patch cable mode cleaning effect fiber_mode_cleaning.pdf
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).
Entry  Mon Apr 8 20:56:52 2013, Koji, Optics, Configuration, PZT & Curverd Mirror arrangement PZT_assembly.pdf
Assembly #1:
Mounting Prism #16
PZT #26
Entry  Fri Aug 9 10:09:56 2013, Koji, General, General, PZT Assembly #3/#4 PZT_assembly.pdf
Yesterday, Jeff and I bonded the PZT assemblies (#3/#4).
The attached is the arrangement of the components
    Reply  Mon Aug 12 20:22:19 2013, Koji, General, General, PZT Assembly #5/#6 
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.
Entry  Sat Jul 6 17:10:07 2013, Koji, Mechanics, Characterization, PZT Response analysis PZT_Scan.pdfL1OMC_PZT_Response.pdf
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.
Entry  Thu Sep 5 15:40:42 2019, shruti, Optics, Configuration, PZT Sub-Assembly Diagrams_SubAssembly.pdfC10_C13_Combinations.pdfPlots_Config_Tolerance.pdf
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.)
Entry  Mon Apr 8 11:49:18 2013, Koji, Mechanics, Characterization, PZT actuator tested at LLO 
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
Entry  Mon Apr 8 21:11:14 2013, Koji, Optics, General, PZT assembly gluing 
[Jeff, Zach, Koji] 
PZT assembly gluing
Glue gun -> to be returned to MIT
    Reply  Tue Apr 9 13:56:09 2013, Koji, Optics, General, PZT assembly post gluing / pre baking pictures 
 
Entry  Sat Mar 23 13:34:14 2013, Koji, Optics, General, PZT assembly prototype glued P3223322.jpgP3223323.jpgP3233336.jpgP3233348.jpg
 
Prototype PZT assembly
Motivation:
Entry  Tue Jul 8 18:54:54 2014, Koji, Mechanics, Characterization, PZT characterization PZT_Scan.pdfI1OMC_PZT_Response.pdf
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.
Entry  Fri Feb 1 12:52:12 2019, Koji, Mechanics, General, PZT deformation simulation pzt.png
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
Entry  Thu Aug 22 15:40:15 2013, Koji, Electronics, Configuration, PZT endurance test P8214340.jpgP8214337.jpgIR_0457.jpgIR_0461.jpg
[Koji, Jeff]
Background
In response to the failure of one of the PZTs on L1OMC (LLO:8366), we
    Reply  Fri Aug 23 19:24:32 2013, Koji, Electronics, Configuration, PZT endurance test (II) PZT_shaking.png
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
Entry  Thu Apr 11 12:15:31 2019, Koji, Mechanics, Configuration, PZT sub assy mirror orientations PZT_subassy.pngPZT_subassy.pdf
 
Entry  Thu Jan 10 20:45:00 2019, Koji, Optics, Characterization, PZT test cable OMC_PZT_wiring.pdf
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.
Entry  Thu Jul 10 01:39:38 2014, Koji, Electronics, General, PZT wire P7096669.JPG
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
Entry  Thu Jun 21 03:07:27 2012, Zach, Optics, Configuration, Parameter selection / mode definition geom_bowtie.pnggeom_non-bowtie.png
EDIT 2 (ZK): As with the previous post, all plots and calculations
here are done with my MATLAB cavity modeling utility, 
Entry  Mon Aug 13 17:01:35 2012, Koji, Clean, General, Particle Counts 
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".
Entry  Tue Sep 25 14:18:14 2012, Koji, Clean, General, Particle Counts 
Particle counts
Before the prefilter is installed: 0.5um 1191cnts, 0.7um 346cnts
2:20 prefilter installed
    Reply  Mon Oct 1 16:06:55 2012, Koji, Clean, General, Particle Counts 
1. It turned out that the particle counter MET ONE 227A at ATF shows 
(particle count)/(0.1 ft^3) 
Entry  Fri Oct 23 19:09:54 2020, Koji, General, General, Particle counter transfered to Radhika 
See this entry: https://nodus.ligo.caltech.edu:8081/40m/15642
Entry  Thu Feb 21 18:44:18 2013, Koji, Optics, Configuration, Perpendicularity test perpendicularity_test.pdfP2203206.JPG
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. 
Entry  Tue Dec 15 13:39:13 2015, Koji, Electronics, Characterization, Phase noise measurement of aLIGO EOM drivers phase_noise.pdfphase_noise_9MHz.pdf
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
Entry  Tue Jul 31 21:33:17 2012, Koji, General, General, Plan Update: August [!] 
Completed work of the previous months: [Jul] [Aug] [Sep] [Oct] [Nov] [Dec]

Facility/Supplies

    Work done
    
        Floor
Entry  Sat Jul 14 02:16:07 2012, Koji, General, General, Plan Update: July P7071878.jpg
Facility/Supplies

    Work in progress     
    
        Floor cleaning
        Plug slits on the roof of the HEPA booth - blanking panels have been ordered 
Entry  Wed Nov 7 20:44:11 2012, Koji, General, General, Plan Update: November [!] OMC_Project_Schedule.pdf
Completed work of the previous months: [Jul] [Aug]
[Sep] [Oct] [Nov]
[Dec]
Entry  Tue Oct 16 15:51:01 2012, Koji, General, General, Plan Update: October [!] 
Completed work of the previous months: [Jul] [Aug]
[Sep] [Oct] [Nov] [Dec]

Facility/Supplies
Entry  Mon Jun 3 21:19:03 2013, Koji, General, General, Planning 
Monday - Evening
(Koji)
[done] - DCPD alignment
Entry  Thu Oct 8 19:55:22 2020, Koji, General, Characterization, Power Measurement of Mephisto 800NE 1166A Mephisto800NE_1166A.pdf
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.
    Reply  Wed Jul 22 09:43:01 2015, Koji, Electronics, AM Stabilized EOM Driver, Power supply test of the EOM/AOM Driver 
Serial Number of the unit: S1500117
Tester: Koji Arai
Test Date: Jul 22, 2015 
Entry  Fri Nov 6 18:38:00 2020, Koji, General, General, Powermeter lent from OMC Lab to 2um ECDL 
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
Entry  Thu Nov 30 12:18:41 2017, Stephen, General, General, Preparation for Modal Testing on 4 December 
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.
Entry  Fri Sep 8 15:14:05 2017, Koji, Facility, General, Preparation for the plumbing work 7x
[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.
Entry  Mon Aug 15 10:09:10 2016, Koji, General, General, Prev H1 OMC shipped to CIT 
Previous H1 OMC shipped from LHO to CIT

https://ics-redux.ligo-la.caltech.edu/JIRA/browse/Shipment-8196
Entry  Tue Dec 18 20:04:40 2012, Koji, Optics, Characterization, Prism Thickness Measurement prism.png
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.
Entry  Thu Jan 19 20:57:53 2017, Koji, Supply, General, Purchase 
Ordered:

Office Depot
v AA battery Qty. 24
    Reply  Thu Feb 16 17:23:12 2017, Koji, Supply, General, Purchase 

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
Entry  Thu Apr 4 20:07:39 2019, Koji, Supply, General, Purchase 
== Office Depot ==
Really Useful Box 9L x 6 (delivered)
Really Useful Box 17L x 5 (ordered 4/4)
Entry  Tue Apr 5 18:14:55 2016, Koji, General, Loan / Lending, QPD Lending Crackle 
Xiaoyue

QPD head
X-Z stage
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