| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
1123
|
Wed Mar 20 20:44:32 2013 |
Evan | DailyProgress | optic | Added Faraday isolator | Today I installed the Faraday isolator
after the PMC. Tara and I then spent some
time trying to figure out why the PDH error |
|
|
1130
|
Tue Mar 26 22:42:23 2013 |
Evan | DailyProgress | optic | Mode matching extravaganza | Tara and I repositioned the QWP and PBS
immediately preceding the periscope so that
we could move the 64.4-mm ROC lens closer |
|
|
1228
|
Mon Jul 8 21:52:04 2013 |
tara | DailyProgress | optic | mode matching to refcavs | I redid the mode matching for
both refcav, the visibilities are up to ~
93% and 95% for RCAV and ACAV. |
|
|
1231
|
Tue Jul 9 19:35:20 2013 |
tara | DailyProgress | optic | beat board is back | I installed the beat board back behind
the cavities. I still have not finished aligning
both beams to the 1811. |
|
|
1233
|
Thu Jul 11 00:19:52 2013 |
tara | DailyProgress | optic | both cavities are locked | Both cavities are locked (not optimized
yet). Since it has been awhile that both
are locked, here is a picture. |
|
|
1263
|
Mon Jul 29 22:30:34 2013 |
tara | Notes | optic | coating optimization for AlGaAs | Since we are trying to optimize a layer
structure for AlGaAs coatings. It is a good
idea to summarize some notes about all the |
|
|
1269
|
Wed Jul 31 00:31:39 2013 |
tara | Notes | optic | coating optimization for AlGaAs | The codes for optimizing Thermo-optic noise
in coatings are up on svn.
I adopt some codes that have been |
|
|
1287
|
Wed Aug 7 20:55:47 2013 |
Evan | DailyProgress | optic | Preparing the EOAM | In preparation for getting the ISS up and
running, Tara and I have been fooling around
with the EOAM and associated half waveplates. |
|
|
1291
|
Fri Aug 9 17:58:01 2013 |
tara | Notes | optic | coating optimization for AlGaAs | Better TO optimized coatings calculation
is done. Now the Transmission, phase reflection,
and TO noise are optimized. |
|
|
1315
|
Tue Aug 27 16:11:26 2013 |
tara | Notes | optic | coating optimization for AlGaAs:error analysis | Since the optimized layer structure is
designed, I'm checking how the coatings properties
change with error in layer thickness. |
8x |
|
1318
|
Wed Aug 28 21:21:38 2013 |
tara | Notes | optic | GWINC for TO calculation: recap | Here is a summary for how I verify the
codes for TO calculation.
So far, we have been using a set |
|
|
1320
|
Sun Sep 1 18:38:37 2013 |
tara | Notes | optic | coating optimization for AlGaAs:error analysis | I updated the optimization and error analysis.
The error in optimized structure is comparable
to that of a standard quarter wave length |
7x |
|
1322
|
Mon Sep 2 18:31:46 2013 |
tara | Notes | optic | coating optimization for AlGaAs:error analysis | Coating optimization and error analysis
are updated, see PSL:1320. |
|
|
1340
|
Wed Sep 18 21:55:11 2013 |
tara | Notes | optic | coating optimization for AlGaAs:error analysis |
Optimized coatings structure.
|
|
|
1344
|
Thu Sep 19 20:38:17 2013 |
tara | Notes | optic | coating optimization for AlGaAs:error analysis | Details for AlGaAs coatings order
Coating
structure can be found in |
|
|
1345
|
Fri Sep 20 19:26:45 2013 |
tara | Notes | optic | coating optimization for AlGaAs:error analysis | I'm using Matt's code to do error analysis
for AlGaAs coatings. This time I vary materials'
parameters and compare the thermo optic noise, |
|
|
1346
|
Fri Sep 20 21:19:29 2013 |
Matt A. | Notes | optic | coating optimization for AlGaAs:error analysis | In our meeting, Eric mentioned
that there might be some uncertainty in how
the average coating properties are calculated. |
|
|
1347
|
Sat Sep 21 23:49:29 2013 |
rana | Notes | optic | coating optimization for AlGaAs:error analysis | I don't understand these values for
n. |
|
|
1348
|
Sun Sep 22 00:27:09 2013 |
some random goon | Notes | optic | coating optimization for AlGaAs:error analysis |
The numbers in the table are
the ratio between the TO noise when the parameter |
|
|
1350
|
Mon Sep 23 18:07:22 2013 |
rana | Notes | optic | coating optimization for AlGaAs:error analysis |
If that's true, then it means that
a 1% deviation in the index of refraction |
|
|
1351
|
Mon Sep 23 18:50:05 2013 |
tara | Notes | optic | coating optimization for AlGaAs:error analysis |
|
|
|
1356
|
Thu Sep 26 23:25:40 2013 |
tara | Notes | optic | coating optimization for AlGaAs:error analysis | I'm trying to find another optimization
that is less sensitive to change in nH and
nL. Here is a few thought and a few examples. |
8x |
|
1359
|
Thu Oct 3 10:34:32 2013 |
tara | Notes | optic | coating optimization for AlGaAs:error analysis | The new optimization is less sensitive
to the values of refractive indices, but
the overall error will not change much if |
|
|
1363
|
Thu Oct 10 01:59:24 2013 |
tara | Notes | optic | coating optimization for AlGaAs:error analysis | I recalculated the coatings properties,
with the values of nH and nL to be 3.48 and
2.977. Note about each optimization is included |
|
|
1365
|
Fri Oct 11 15:23:54 2013 |
tara | Notes | optic | coating optimization for AlGaAs:electric field in coating layer | Electric field in coating layer is calculated.
This will be used in loss calculation in
AlGaAs coatings. |
6x |
|
1367
|
Mon Oct 14 21:02:00 2013 |
tara | Notes | optic | coating optimization for AlGaAs:variation in x | I checked the dependent of coatings properties
with the uncertainty in x (amount of Al in
Al_x Ga_(1-x) As). |
|
|
1374
|
Sun Oct 27 20:12:25 2013 |
tara | Notes | optic | photothermal noise in AlGaAs | I revised the calculation for photo-thermal
noise in AlGaAs coatings, the photo thermal
noise should not be a limiting source. |
|
|
1376
|
Wed Oct 30 01:56:38 2013 |
tara | DailyProgress | optic | table work | I'm optimizing the setup, and clearing
the table a little bit.
Self homodyne setup in |
|
|
1379
|
Fri Nov 1 00:22:40 2013 |
tara | DailyProgress | optic | more optimization | I'm putting EOAM back on ACAV path. The
setup is roughly optimized.
(14.75 MHz) EOM , EOAM, quarter waveplate |
|
|
1385
|
Fri Nov 8 03:36:44 2013 |
tara | DailyProgress | optic | redo- PMC path | I'm re-arranging the optics in PMC path
a bit. The work is in progress, so ACAV path
is still down. |
|
|
1386
|
Mon Nov 11 19:37:13 2013 |
tara | DailyProgress | optic | redo- PMC path | PMC path is back, I aligned the polarization
of the input beam to the BB EOM for TTFSS.
The visibility of PMC is now ~ 80%. |
|
|
1392
|
Wed Dec 18 21:05:28 2013 |
tara | Notes | optic | photothermal noise in AlGaAs: thickness resolution | We heard back from G. Cole about the thickness
resolution in the AlGaAs coating manufacturing
process will be around 0.5 A. So I'm checking |
8x |
|
1403
|
Mon Feb 3 23:56:07 2014 |
tara | Photos | optic | packing mirror | I"m packing the mirrors so that
they are ready to be shipped to G. Cole.
The mirrors are packed properly, see |
|
|
1425
|
Sat May 17 22:01:28 2014 |
tara | Notes | optic | Coating TO opt for Adv LIGO: ETM | Here is a prelim result
for AlGaAs TO opt for ETM coating.
|
7x |
|
1426
|
Sun May 18 10:45:42 2014 |
tara | Notes | optic | Coating TO opt for Adv LIGO | I did an optimized structure
for ITM and plotted the estimated noise budget
of AdvLIGO using optimized AlGaAs coating |
|
|
1437
|
Thu Jun 26 12:07:17 2014 |
Evan | DailyProgress | optic | HWP adjustments; south locking | I wanted enough power to accommodate both
the fiber noise measurement and the south
cavity locking. I moved the HWP after the |
|
|
1439
|
Sun Jun 29 19:04:13 2014 |
Emily, Evan | Notes | optic | fiber phase noise measurement | Installation of
optics for fiber phase noise measurement |
|
|
1449
|
Tue Jul 15 18:26:20 2014 |
tara | DailyProgress | optic | setting up scattered light measurement | I'm setting up a scattered
light measurement for AlGaAs samples. The
methods are summarized below. |
|
|
1452
|
Thu Jul 17 18:57:54 2014 |
tara | DailyProgress | optic | setting up scattered light measurement | I'm testing the setup and
a code for extracting scattered light from
the images. |
|
|
1455
|
Wed Jul 23 00:28:14 2014 |
tara | DailyProgress | optic | setting up scattered light measurement | I'm checking
the linearity of power and exposure on the
camera. The ccd counts are quite linear with |
|
|
1456
|
Thu Jul 24 02:00:23 2014 |
tara | DailyProgress | optic | setting up scattered light measurement | I rechecked the CCD response
vs exposure time and power. The results
are linear. |
|
|
1457
|
Thu Jul 24 17:11:18 2014 |
Evan | DailyProgress | optic | Calibration for scattered light measurement | [Tara, Evan, Josh, et al.]
Today we did some characterization
and calibration of the scattered light apparatus. |
|
|
1458
|
Fri Jul 25 08:12:40 2014 |
Evan | DailyProgress | optic | Calibration for scattered light measurement |
|
|
|
1459
|
Fri Jul 25 14:21:34 2014 |
Evan | DailyProgress | optic | Calibration for scattered light measurement |
|
|
|
1460
|
Sun Jul 27 19:46:16 2014 |
Evan | DailyProgress | optic | BRDF of AlGaAs mirror 137B1 | [Tara, Evan]
We replaced the Lambertian diffuser
with AlGaAs mirror 137B1. We intentionally |
|
|
1461
|
Tue Jul 29 11:40:09 2014 |
Evan | DailyProgress | optic | BRDF of AlGaAs mirror 143 | [Tara, Evan]
Yesterday we took a scatter measurement
of AlGaAs mirror #143. Instead of one bright |
|
|
1462
|
Wed Jul 30 17:47:56 2014 |
tara | DailyProgress | optic | BRDF of AlGaAs mirror 143 | I
used the setup to measure scattered loss
from an REO mirror (mirror for iLIGO refcav, |
|
|
1463
|
Thu Jul 31 09:40:24 2014 |
Evan | DailyProgress | optic | BRDF of AlGaAs mirror 114 | [Tara, Evan]
Tara took a BRDF measurement yesterday
of AlGaAs mirror #114. |
|
|
1465
|
Mon Aug 4 15:23:06 2014 |
Evan | DailyProgress | optic | BRDF of AlGaAs mirror 114 after cleaning | [Tara, Evan]
Tara also took a BRDF measurement
of #114 after cleaning it. |
|
|
1466
|
Tue Aug 5 08:14:14 2014 |
Evan | DailyProgress | optic | BRDF of AlGaAs mirror 141 after cleaning | Incident power: 20.0(1) mW
Exposure times used: 25 ms, 50 ms,
200 ms, 500 ms, 1000 ms |
|