 Thu Mar 7 15:53:47 2013, Koji, Mechanics, General, OMC Transportation fixture, OMC PD/QPD mounts 
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Tue Mar 5 19:37:00 2013, Zach, Optics, Characterization, eLIGO OMC visibility vs. power measurement details
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EDIT (ZK): Koji points out that (1 - Ti) should really be the non-resonant reflectivity of the aligned cavity, which is much closer to 1. However,
it should *actually* be the non-resonant reflectivity of the entire OMC assembly, including the steering mirror (see bottom of post). The steering mirror
has T ~ 0.3%, so the true results are somewhere between my numbers and those with (1 - Ti) -> 1. In practice, though, these effects are swamped by the |
 Wed Mar 6 23:24:58 2013, Zach, Optics, Characterization, eLIGO OMC visibility vs. power measurement details
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I found that, in fact, I had lowered the modulation depth since when I measured it to be 0.45 rads --> Psb = 0.1.
Here is the sweep measurement:
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Mon Feb 4 00:39:08 2013, Koji, Optics, Characterization, Wedge measurement with the autocollimator and the rotation stage
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Method:
Mount the tombstone prism on the prism mount. The mount is fixed on the rotation stage.
Locate the prism in front of the
autocollimator.
Find the retroreflected reticle in the view. Adjust the focus if necessary.
Confirm that the rotation of the |
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Wed Feb 6 02:34:10 2013, Koji, Optics, Characterization, Wedge measurement with the autocollimator and the rotation stage
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Measurement:
A6: α = 0.665 deg, β = +3.0 arcmin (1.5 div up)
A7: α = 0.635 deg, β =
0.0 arcmin (0.0 div up)
A8: α = 0.623 deg, β = - 0.4 arcmin (-0.2 div up)
A9: α = |
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Fri Mar 1 23:52:18 2013, Koji, Optics, Characterization, Wedge measurement with the autocollimator and the rotation stage
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Measurement:
E1: α = 0.672 deg, β = +0.0 arcmin (0 div up)
E2: α = 0.631 deg, β = - 0.3 arcmin
(-0.15 div down)
E3: α = 0.642 deg, β = +0.0 arcmin (0 div up)
E4: α = 0.659 deg, β |
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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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Wed Feb 27 18:18:48 2013, Koji, Optics, Configuration, More perpendicularity test
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Mounting Prisms:
(criteria: 30arcsec = 145urad => 0.36mm spot shift)
SN Meas.(div) ArcSec Spec. |
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Fri Mar 1 23:06:15 2013, Koji, Optics, Configuration, More perpendicularity test final
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Perpendicularity of the "E" mirror was measured.
Mounting Prisms:
(criteria: 30arcsec = 145urad => 0.36mm spot shift) |
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Thu Feb 7 23:01:45 2013, Koji, Optics, Characterization, UV epoxy gluing test
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[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). |
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Thu Feb 7 21:35:46 2013, Koji, General, General, Dmass's loan of LB1005 / A2&C2 sent to Fullerton / First Contact @40m
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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. |
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Tue Jan 22 17:56:32 2013, Koji, Mechanics, General, Rotary stage selection
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Newport UTR80
Sensitivity: 4 arcsec
Graduations: 1 deg
Vernier: 1 arcmin
Fine travel range: 4 deg
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Tue Jan 22 11:10:25 2013, Koji, Facility, General, Eyeware storage and hooks for the face shields are installed
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| A carpenter has come to install the eyeware storage and hooks for the face shields. |
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Sat Jan 19 20:47:41 2013, Koji, Optics, Characterization, Wedge measurement with the autocollimator
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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. |
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Fri Jan 18 13:25:17 2013, Koji, Optics, Configuration, Autocollimator calibration
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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 |
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Wed Jan 16 14:10:50 2013, Koji, Optics, Characterization, Autocollimator tests of optics perpendicularity/parallelism
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The items:
- Autocollimator (AC) borrowed from Mike Smith (Nippon Kogaku model 305, phi=2.76", 67.8mm)
- Retroreflector (corner cube) |
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Sun Jan 6 23:22:21 2013, Koji, Mechanics, General, SolidWorks model of the OMC suspension
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Wed Jan 2 07:45:39 2013, Koji, Optics, Characterization, First Contact test
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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) |
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Wed Jan 2 07:35:55 2013, Koji, Optics, Characterization, Thickness of a curved mirror
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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 |
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Mon Dec 31 03:11:45 2012, Koji, Optics, Characterization, Further more RoC measurement
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Total (excluding C2, C7, C8): 2.575 +/- 0.005 [m]
New results
C6: RoC: 2.57321 +/− 4.2e-05m |
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Mon Dec 31 03:10:09 2012, Koji, Optics, General, SolidWorks model of the OMC breadboard
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Mon Dec 31 01:45:04 2012, Koji, General, General, Work completed in Nov and Dec [!]
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Completed work of the previous months: [Jul] [Aug]
[Sep] [Oct] [Nov] [Dec] |
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Wed Dec 26 14:33:33 2012, Koji, Facility, General, Lase Interlock wired
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| Two switches are connected in series. |
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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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Wed Dec 19 18:47:03 2012, Koji, Clean, General, First Contact Training with Margot
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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 |
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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 Nov 29 21:18:23 2012, Koji, Optics, General, OMC Mounting Prisms have come
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Mon Nov 26 01:40:00 2012, Koji, Optics, Characterization, More RoC measurement
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C1: RoC: 2.57845 +/− 4.2e−05m
C2: RoC: 2.54363 +/− 4.9e−05m
C3: RoC: 2.57130 +/− 6.3e−05m |
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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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Mon Nov 19 13:33:14 2012, Koji, Optics, Characterization, Resuming testing mirror RoCs
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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 |
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Sat Nov 17 02:31:34 2012, Koji, Optics, Characterization, Mirror T test
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Mirror T test
The mirror was misaligned to have ~2deg incident (mistakenly...) angle.
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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... |
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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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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 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 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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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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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 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 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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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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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 14:50:54 2012, jamie, jeff, General, General, OMC breadboard/plate measurement dimensions
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We have measured the dimensions and mass of the OMC glass plates/breadboards:
S/N
Mass (g)
Length
(mm)
Width (mm)
Height (mm)
Notes
01
6146
449.66
149.85
41.42, |
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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 9 05:03:15 2012, Koji, Electronics, General, OMC Test Electronics Setup
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Tue Oct 9 04:59:24 2012, Koji, Optics, General, OMC Test Optical Setup
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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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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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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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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 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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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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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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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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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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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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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 |