 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, |
 Mon Mar 25 18:34:25 2013, Koji, General, General, OMC building plan / procedure ~ Mar 25 Mon
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25 March (Mon):
Inspect the test PZT assembly
=> Give it to Bob. (done)
Glue topside components |
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Wed Mar 27 20:54:45 2013, Koji, General, General, OMC building plan / procedure ~ Mar 26 Mon
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26 March (Tue):
- Curved mirror characterization (Koji, done)
- Input optics for the cavity locking (Zach) |
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Wed Mar 27 20:54:54 2013, Koji, General, General, OMC building plan / procedure ~ Mar 27 Wed
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27 March (Wed)
- AOM drift investigation (Lisa, Zach)
- Cavity input optics ~ Fiber coupling (Zach) |
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Wed Mar 27 20:55:10 2013, Koji, General, General, OMC building plan / procedure ~ Mar 28 Thu
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28 March (Thu):
Rebuild the bottom template in the lab
Place the bottom template on the OMC
Glue the PZTs on the mounting
prisms (x2)
Glue the curved mirrors on the PZTs (x2)
R&T measurement
Placing optics on the OMC breadboard |
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Mon Mar 25 02:04:05 2013, Koji, General, General, OMC building plan / procedure ~ WB18
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WB 18 March
Diode test
Dark current / Dark noise / Impedance
Quantum Efficiency test (but with glass)
Diode given |
Sat Feb 4 03:30:02 2023, Koji, Electronics, General, OMC cables #4 arrived 
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The OMC cables #4 arrived on Feb 3rd. (See Attachment)
This shipment included two DCPD cables and two QPD cables. It means that the direct wiring from the PZT to the mighty mouse connectors was not
included in the shipment. |
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Wed Feb 15 16:00:46 2023, Stephen, Electronics, General, OMC cables #4 inspected
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Inspection
Updated ICS (Shipment-12578) and moved those parts to Storage-9482.
Inspection showed the following: |
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Mon Jun 3 18:58:08 2013, Koji, Optics, Configuration, OMC final tests
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- QPD mount aligned, QPD output checked
The spots are with 100um from the center of the diodes. [ELOG Entry (2nd photo)]
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Thu Apr 18 20:47:54 2019, Joe, Optics, , OMC initial alignment and locking
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[Joe, Phillip, Koji, Stephen]
*draft post, please add anymore info if I missed something*
made initial alignment of the cavity. To do this we used the periscope mirrors to aim the incoming beam at the centre of the |
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Fri Apr 19 11:34:19 2019, Koji, Optics, , OMC initial alignment and locking
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The spot on CM1 was found displaced by 3.4mm (horiz.) and 3.0mm (vert.) in the upper right direction looking from the face side.
The spot on CM2 was found displaced by 1.2mm (horiz.) and 1.8mm (vert.) in the upper left direction looking from the face side.
The drawing on the left side of the attachment shows the estimated misalignment when we think they all come from the curved |
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Fri May 3 21:09:08 2013, Koji, General, General, OMC is back
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| L1 OMC is back on the table for the action next week. |
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Mon May 20 14:59:21 2013, Koji, General, General, OMC is out from the oven
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The OMC came back to the table again.
No obvious change is visible: no crack, no delamination
The OMC was fixed on the table and the beam was aligned to the cavity |
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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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Wed Dec 7 21:18:35 2016, Koji, General, General, OMC placed on the table / the beam roughly aligned
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The OMC mode matching sled was fixed on the nominal part of the table. Then the OMC was located at the nominal position marked by three poles.
The input periscope was adjusted to have the input beam roughtly centered on the OMC QPDs. This made the beam from FM2 aligned to the missing
CM1, and the beam just went through the hole of the mounting prism. Very promising! |
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Thu Dec 8 21:17:09 2016, Koji, General, General, OMC placed on the table / the beam roughly aligned
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The OMC cavity was locked. The alignment was precisely adjusted. The mode matching was optimized by the lens positions. The reflection during the lock
is ~0.01 compared to the full reflection on non-resonance, meaning the mode matching is ~99%. The error signal was maximized (i.e. demod pahse was adjusted)
by sweeping the modulation frequency. Note that the EOM is broad band. The modulation freq chosen today was 34.6MHz. |
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Sun Jul 6 02:46:20 2014, Koji, Optics, Characterization, OMC power budget
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3rd OMC power budget (2014/7/2)
Input power: 34.8mW
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Wed Apr 24 13:58:51 2019, Joe, Optics, Characterization, OMC power budget and UV Epoxy Bonding of BS1
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[koji,philip,joe,liyuan,stephen]
need to add spot positions.
Mirrors: PZT11,PZT22, A14, A5 |
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Tue Mar 25 17:10:10 2014, Koji, Optics, Characterization, OMC spot position estimation
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| Spot positions were inferred from the photos |
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Mon Mar 6 16:02:56 2023, Thejas , Optics, General, OMC test setup locking
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On Feb 16, Camille and I attampted at locking the OMC cavity. It was quick to re-align the beam to the cavity (by using only the fine adjustment
of the output fibre couple). This was done by looking to minimize the power reflected from the cavity and observing the mode shapes on the CCD.
After we achieved locking we placed the lid of the OMC back and turned off the laser. |
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Thu Mar 28 16:36:52 2019, Koji, Mechanics, Characterization, OMC(002) PZT characterization
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As performed in the ELOG 202, the PZTs of the OMC 002 were tested.
DC response was measured by sweeping each PZT with 0-150V triangular voltage at 11Hz. Acquire 0.2sec of the tie series using an oscilloscope
to get the PDH error, cavity transmission, and the sweep signal. |
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Fri Apr 5 01:08:17 2019, Koji, Optics, Characterization, OMC(002): DCPD / QPD alignment
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The beam height in the cavity became totally different from the previous one and the shims needed to be much thicker than before. This is probably because
of the alignment of the newly-glue curved mirror.
As the beam height is 2~2.5mm higher, two shims need to be stacked. The preliminary check of the heights using the alignment disks (dummy PDs) |
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Fri Apr 5 20:50:54 2019, Koji, Optics, Characterization, OMC(002): QPD alignment
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QPD# QPD1 QPD2
Housing# #004 #008
Diode# #44 #46 |
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Fri Apr 5 01:07:18 2019, Koji, Optics, Characterization, OMC(002): transmitted beam images
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There was a concern that the transmission from CM1 has additional fringes. The shape of the transmitted beams from CM1, CM2, and FM2 (main) werecaptured
with WinCamD.
Indeed CM1 and CM2 have the fringes, but it does not exist in the main transmission. So it seems that the fringes are associated with the curved |
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Tue Apr 16 16:40:26 2019, Koji, General, Configuration, OMC(004): A Mirror selection
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We are going to use A5 and A14 for FM1 and FM2. (The role of these two can be swapped)
The reason for the selection is the better perpendicularity among the available prisms.
A11 has the best perpendicularity among them. However, the T didn't match with the others. The pair of A5 and A14 has a good matching with |
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Tue Apr 16 16:52:36 2019, Koji, Optics, Configuration, OMC(004): B Mirror selection
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We are going to use B6 for the DCPD BS (BS2), and B1 for the QPD BS (BS3). Their role can not be swapped.
B6 has the best loss among the available ones, while the perpendicularity is not so critical due to the short arm.
B1 has the OK perpendicularity, while the loss is also moderately good. |
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Tue Apr 16 17:24:56 2019, Koji, Optics, Configuration, OMC(004): E Mirror selection
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We are going to use E6, E9, E11, and E14 for BS1, SM1, SM2, and SM3. They (and E18) are all very similar.
The attachment is the excerpt from T1500060 with some highlighting |
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Tue Apr 16 16:35:09 2019, Koji, Optics, Configuration, OMC(004): Glass breadboard selection
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D1200105 SN006 was selected as the breadboard for OMC(004).
The reason is the best parallelism among the unused ones.
The attached is the excerpt from T1500060 with the #006 highlighted. |
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Thu Apr 11 21:22:58 2019, Koji, General, General, OMC(004): PZT sub-assembly air baking
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[Stephen Koji]
The baking of the PZT subassemblies was more complicated than we initially thought.
The four PZT subassemblies were placed in the air bake oven A. We meant to bake the assemblies with the ramp time of 2.5h, a plateau of 2h at |
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Thu Apr 11 21:22:26 2019, Koji, Mechanics, General, OMC(004): PZT sub-assembly gluing
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[Koji Stephen]
The four PZT sub-assemblies were glued in the gluing fixtures. There were two original gluing fixtures and two additional modified fixtures for
the in-situ bonding at the repair of OMC(002). |
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Mon Sep 23 21:29:51 2019, Koji, Optics, General, OMC(004): PZT sub-assembly gluing (#9/#10)
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[Stephen, Shruti, Koji]
We worked on the gluing of the PZT sub-assy (#9 and #10) along with the designed arrangement by Shruti (OMC
ELOG 374). |
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Mon Sep 30 23:16:53 2019, Koji, Optics, General, OMC(004): PZT sub-assembly gluing (#9/#10)
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Friday: [Stephen, Koji]
As the oven setting has qualified, we brought the PZT assys in the air bake oven.
Monday: [Stephen, Shruti, Koji] |
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Sun Apr 14 23:58:49 2019, Koji, General, General, OMC(004): PZT sub-assembly post air-bake inspection
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[Koji Stephen]
(Friday afternoon) We retrieved the PZT sub-assemblies to the clean room.
We started removing the ASSYs from the fixtures. We noticed that some part of the glass and PZT are ripped off from the ASSY and stuck with the |
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Mon Apr 15 01:23:45 2019, Koji, General, General, OMC(004): PZT sub-assembly post air-bake inspection (Sub-assy #10)
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Sub-ASSY #10
Attachment #1: Mounting Block SN021
Attachment #2: PZT-Mounting Block bonding looks just excellent. |
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Mon Apr 15 00:08:32 2019, Koji, General, General, OMC(004): PZT sub-assembly post air-bake inspection (Sub-assy #7) 6x
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Sub-ASSY #7
Probably the best glued unit among the four.
Attachment #1: Mounting Block SN001 |
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Mon Apr 15 00:39:04 2019, Koji, General, General, OMC(004): PZT sub-assembly post air-bake inspection (Sub-assy #8) 8x
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Sub-ASSY #8
Probably the best glued unit among the four.
Attachment #1: Mounting Block SN007 |
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Mon Apr 15 01:07:30 2019, Koji, General, General, OMC(004): PZT sub-assembly post air-bake inspection (Sub-assy #9) 7x
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Sub-ASSY #9
The most fractured unit among four.
Attachment #1: Mounting Block SN017 |
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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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Tue Apr 16 11:36:36 2019, Koji, Optics, Characterization, OMC(004): PZT testing for spare OMC 9x
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Attachment 1: Shadow sensor setup for the PZT displacement test
Attachment 2: PZT endurance test. 4 PZTs were shaken at once.
Attachment 3~5: Function generator setup 100Hz, 3.5Vpp 1.75Voffset (meant be displayed for 50Ohm load) |
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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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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 |