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Entry  Thu Feb 7 23:01:45 2013, Koji, Optics, Characterization, UV epoxy gluing test 
 [Jeff, Yuta, Koji]
Gluing test with UV-cure epoxy Optocast 3553-LV-UTF-HM
- This glue was bought in the end of October (~3.5 months ago).
Entry  Thu Feb 7 21:35:46 2013, Koji, General, General, Dmass's loan of LB1005 / A2&C2 sent to Fullerton / First Contact @40m P2053119.jpgP2053120.JPG
Dmass borrowed the LB1005 servo amp from the OMC lab.
It happened this week although it seems still January in his head. Got it back on Mar 24th
The A2 and C2 mirrors have been sent to Josh Smith at Fullerton for the scatterometer measurement.
Entry  Tue Jan 22 17:56:32 2013, Koji, Mechanics, General, Rotary stage selection 
Newport UTR80

    Sensitivity: 4 arcsec
    Graduations: 1 deg
    Vernier: 1 arcmin
    Fine travel range: 4 deg
Entry  Tue Jan 22 11:10:25 2013, Koji, Facility, General, Eyeware storage and hooks for the face shields are installed P1223116.JPG
A carpenter has come to install the eyeware storage and hooks for the face shields.
Entry  Sat Jan 19 20:47:41 2013, Koji, Optics, Characterization, Wedge measurement with the autocollimator autocollimator_wedge_measurement.pdf
The wedge angle of the prism "A1" was measured with the autocollimator (AC).
The range of the AC is 40 arcmin. This means that the mirror tilt of 40arcmin can be measured with this AC.
This is just barely enough to detect the front side reflection and the back side reflection.
Entry  Fri Jan 18 13:25:17 2013, Koji, Optics, Configuration, Autocollimator calibration autocollimator_calibration.pdf
An autocollimator (AC) should show (0,0) if a retroreflector is placed in front of the AC.
However, the AC may have an offset. Also the retroreflector may not reflect the beam back with an exact parallelism.
To calibrate these two errors, the autocollimator is calibrated. The retroreflector was rotated by 0, 90, 180, 270 deg
Entry  Wed Jan 16 14:10:50 2013, Koji, Optics, Characterization, Autocollimator tests of optics perpendicularity/parallelism 
The items:
- Autocollimator (AC) borrowed from Mike Smith (Nippon Kogaku model 305, phi=2.76", 67.8mm)
- Retroreflector (corner cube)
Entry  Sun Jan 6 23:22:21 2013, Koji, Mechanics, General, SolidWorks model of the OMC suspension  D0900295_AdvLIGO_SUS_Output_Mode_Cleaner_Overall_Assembly.pngD0900295_AdvLIGO_SUS_Output_Mode_Cleaner_Overall_Assembly.easm
Entry  Wed Jan 2 07:45:39 2013, Koji, Optics, Characterization, First Contact test Cav_scan_response_zoom_20121125_C2_before.pdfCav_scan_response_zoom_20121125_C2_after.pdf
Conclusion: Good. First contact did not damage the coating surface, and reduced the loss

- Construct a cavity with A1 and C2
- Measure the transmission and FWHM (of TEM10 mode)
Entry  Wed Jan 2 07:35:55 2013, Koji, Optics, Characterization, Thickness of a curved mirror 
Measured the thickness of a curved mirror:
Took three points separated by 120 degree.
S/N: C2, (0.2478, 0.2477, 0.2477) in inch => (6.294, 6.292, 6.292) in mm
Entry  Mon Dec 31 03:11:45 2012, Koji, Optics, Characterization, Further more RoC measurement Cav_scan_response_zoom_20121125_C6_9.pdf
Total (excluding C2, C7, C8): 2.575 +/- 0.005 [m]
New results
C6: RoC: 2.57321 +/− 4.2e-05m    
Entry  Mon Dec 31 03:10:09 2012, Koji, Optics, General, SolidWorks model of the OMC breadboard D1201439_aLIGO_Breadboard_layout_assy_121224.pngD1201439_aLIGO_Breadboard_layout_assy_130105.easm
Entry  Mon Dec 31 01:45:04 2012, Koji, General, General, Work completed in Nov and Dec [!] 
Completed work of the previous months: [Jul] [Aug]
[Sep] [Oct] [Nov] [Dec]
Entry  Wed Dec 26 14:33:33 2012, Koji, Facility, General, Lase Interlock wired PC263073.jpgPC263074.jpgPC263075.jpg
Two switches are connected in series.
Entry  Mon Jul 23 17:15:14 2012, Koji, Clean, General, Talking with Margot 
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
    Reply  Wed Dec 19 18:47:03 2012, Koji, Clean, General, First Contact Training with Margot 
Steve and I visited Margot to have a training session for application of First Contact on optics.
- Make "thick" layer of first contact. It becomes thin when it gets dried.
- Apply more FC once a peek sheet is placed on the FC
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 Nov 29 21:18:23 2012, Koji, Optics, General, OMC Mounting Prisms have come PB293030.JPGPB293032.JPG

Entry  Mon Nov 26 01:40:00 2012, Koji, Optics, Characterization, More RoC measurement RoC_measurement.pdf
C1: RoC: 2.57845 +/− 4.2e−05m
C2: RoC: 2.54363 +/− 4.9e−05m
C3: RoC: 2.57130 +/− 6.3e−05m    
Entry  Thu Oct 18 20:23:33 2012, Koji, Optics, Characterization, Improved measurement Cav_scan_response_zoom_20121017.pdfdetailed_RoC_setup.pdf
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
    Reply  Mon Nov 19 13:33:14 2012, Koji, Optics, Characterization, Resuming testing mirror RoCs Cav_scan_response_zoom_20121016.pdf
In order to resume testing the curvatures of the mirrors, the same mirror as the previous one was tested.
The result looks consistent with the previous measurement.
It seems that there has been some locking offset. Actually, the split peaks in the TF@83MHz indicates 
Entry  Sat Nov 17 02:31:34 2012, Koji, Optics, Characterization, Mirror T test 
Mirror T test
The mirror was misaligned to have ~2deg incident (mistakenly...) angle.
Entry  Fri Nov 9 00:43:32 2012, Koji, Optics, Characterization, Further more wedge measurement wedge_measurement_overall.pdf121108a_A1.pdf
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...
Entry  Thu Nov 8 20:12:10 2012, Koji, Optics, Configuration, How many glass components we need for a plate 
Optical prisms 50pcs (A14+B12+C6+E18)
Curved Mirrors 25pcs (C13+D12)

Entry  Thu Nov 8 19:52:57 2012, Koji, Optics, General, How to apply UV epoxy UVepoxy.jpg
KA's question:
Do you know how to apply this epoxy? 
Do we need a plunger and a needle for this purpose?
Entry  Thu Nov 8 19:47:55 2012, Koji, Electronics, Configuration, Solder for PZTs 
Rich saids:
I have ordered a small roll of solder for the OMC piezos. 
Entry  Thu Nov 8 13:24:53 2012, Koji, Optics, Characterization, More wedge measurement wedge_measurement_overall.pdf
Horiz Wedge    0.497    +/-    0.004 deg
Vert Wedge      0.024    +/-    0.004 deg
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]
Entry  Wed Nov 7 20:21:42 2012, Koji, General, General, Work completed in October [!] 
Completed work of the previous months: [Jul] [Aug]
[Sep] [Oct] [Nov]
Entry  Wed Nov 7 01:28:20 2012, Koji, Optics, Characterization, Wedge angle test (A1) wedge_measurement.pngwedge_measurement_setup.png
Wedge angle test
Result: Wedge angle of Prism A1: 0.497 deg +/- 0.004 deg

Entry  Wed Oct 17 20:36:04 2012, Koji, Optics, General, RoC test cavity locked detailed_RoC_setup.pdfomc_cav_lock_SCRN_SHOT.pngCav_scan_response_20121016.pdf
The RoC test setup has been built on the optical table at ATF.

The cavity formed by actual OMC mirrors have been locked.
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]

Entry  Tue Oct 16 15:50:09 2012, Koji, General, General, Work completed in August/September [!] 

    Work done
        Floor cleaning
        Placing sticky
mats [ELOG]
        Label Maker
Entry  Tue Oct 16 14:50:54 2012, jamie, jeff, General, General, OMC breadboard/plate measurement dimensions 
We have measured the dimensions and mass of the OMC glass plates/breadboards:

Mass (g)
Width (mm)
Height (mm)

Entry  Fri Oct 12 17:15:19 2012, Koji, Optics, General, Loan from the 40m / ATF 

    HWP set
        Optics: CVI QWPO-1064-08-2-R10

       Mount: New Focus #9401
Entry  Tue Oct 9 05:03:15 2012, Koji, Electronics, General, OMC Test Electronics Setup electronics_setup.pngelectronics_setup.pdf
Entry  Tue Oct 9 04:59:24 2012, Koji, Optics, General, OMC Test Optical Setup OMC_test_setup.pngOMC_test_setup.pdf

Entry  Mon Oct 8 11:30:47 2012, Koji, Optics, General, EG&G 2mm photodiode angle response 
EGE&G 2mm photodiode angle response measured by Sam T1100564-v1
Entry  Fri Oct 5 03:39:58 2012, Koji, Optics, General, RoC Test setup RoC_test_setup.pdfRoC_test_setup.png
Based on Zach's experiment design, I wrote up a bit more detailed optical layout for the mirror test.
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  Wed Aug 22 20:16:43 2012, Koji, Facility, General, Workbenches have been installed / Clean room stools P8171968.jpgP8171969.jpg
Last Friday, new workbenches were installed. Vladimir got a new table and a cleanroom stool.
Entry  Tue Aug 14 03:29:06 2012, Koji, Supply, General, Clean supply rack P8131959.JPGP8131961.JPG
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.
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  Mon Aug 13 16:59:11 2012, Koji, Clean, General, Room Cleaning Log 
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)
Entry  Sat Aug 11 00:59:14 2012, Koji, Facility, General, Laser Safety Barrier P8131960.JPG
It seemed that a laser safety barrier was installed today!?
Entry  Wed Aug 1 19:35:00 2012, Koji, Facility, General, Floor cleaned / Workbench being built / Table top defect P8011949.JPGP8011947.JPGP8011948.JPG
- The floor of the room was cleaned and waxed!
- Sticky mats are placed! Now we require shoe covers!
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]


    Work done
Entry  Tue Jul 31 21:29:43 2012, Koji, General, General, Work completed in July [!] 

    Completed Work: Facility/Supplies
        Plug a big hole on the wall [ELOG]
        Purchasing work benches
Entry  Tue Jul 24 11:41:29 2012, Koji, General, General, Useful references 
Nicolas Smith,
LIGO Document T0900383-v1 
3mm Photodiode Characterization for Enhanced LIGO
Entry  Fri Jun 29 11:26:04 2012, Zach, Optics, Characterization, RoC measurement setup RoC_measurement_setup.pngRoC_measurement_setup.graffle.zip
Here is the proposed RoC measurement setup. Koji tells me that this is referred to as "Anderson's method".
We would like to use a linear cavity to measure the RoC of the curved mirrors independently (before forming the ring cavity), since the degeneracy
of HOMs will make the fitting easier.
    Reply  Sun Jul 22 15:56:53 2012, Zach, Optics, Characterization, RoC measurement setup detailed_RoC_setup.pngdetailed_RoC_setup.graffle.zip
Here is a more detailed version of the setup, so that we can gather the parts we will need.
Entry  Wed Jul 18 23:20:13 2012, Koji, Optics, Characterization, Mode scan results of ELIGO 
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:
Entry  Sat Jul 14 02:16:07 2012, Koji, General, General, Plan Update: July P7071878.jpg

    Work in progress     
        Floor cleaning
        Plug slits on the roof of the HEPA booth - blanking panels have been ordered 
ELOG V3.1.3-