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ID Date Author Type Categoryup Subject Text Attachments
  1130   Tue Mar 26 22:42:23 2013 EvanDailyProgressopticMode matching extravaganzaTara 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 taraDailyProgressopticmode 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 taraDailyProgressopticbeat board is backI 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 taraDailyProgressopticboth cavities are lockedBoth cavities are locked (not optimized
yet). Since it has been awhile that both
are locked, here is a picture.
 photo_2013_07_10.JPG 
  1263   Mon Jul 29 22:30:34 2013 taraNotesopticcoating optimization for AlGaAsSince we are trying to optimize a layer
structure for AlGaAs coatings. It is a good
idea to summarize some notes about all the
 multilayer1.JPGmultilayer2.JPGopt1_2013_07_29.pngnb_opt1_2013_07_29.pngT1200003_refcav.png 
  1269   Wed Jul 31 00:31:39 2013 taraNotesopticcoating optimization for AlGaAsThe 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 EvanDailyProgressopticPreparing the EOAMIn 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 taraNotesopticcoating optimization for AlGaAsBetter TO optimized coatings calculation
is done. Now the Transmission, phase reflection,
and TO noise are optimized.
 TOoptimized_2013_08_09.pngTOoptimized_2013_08_09.figTO_opt_200ppm_layer.pngTO_opt_200ppm_layer.fig2013_08_09_TOopt_200ppm.mat 
  1315   Tue Aug 27 16:11:26 2013 taraNotesopticcoating optimization for AlGaAs:error analysisSince 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 taraNotesopticGWINC for TO calculation: recapHere 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 taraNotesopticcoating optimization for AlGaAs:error analysisI 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 taraNotesopticcoating optimization for AlGaAs:error analysisCoating optimization and error analysis
are updated, see PSL:1320.
  
  1340   Wed Sep 18 21:55:11 2013 taraNotesopticcoating optimization for AlGaAs:error analysis 
Optimized coatings structure.
 
 opt_coatings.mat 
  1344   Thu Sep 19 20:38:17 2013 taraNotesopticcoating optimization for AlGaAs:error analysisDetails for AlGaAs coatings order

    
    Coating
structure can be found in 
 power_vs_mirror_size.png 
  1345   Fri Sep 20 19:26:45 2013 taraNotesopticcoating optimization for AlGaAs:error analysisI'm using Matt's code to do error analysis
for AlGaAs coatings. This time I vary materials'
parameters and compare the thermo optic noise,
 error_check_params.pngerror_check_params.figerror_thick_params_compare.pngerror_thick_params_compare.fig 
  1346   Fri Sep 20 21:19:29 2013 Matt A.Notesopticcoating optimization for AlGaAs:error analysisIn 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 ranaNotesopticcoating optimization for AlGaAs:error analysis I don't understand these values for
n.  
  
  1348   Sun Sep 22 00:27:09 2013 some random goonNotesopticcoating 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 ranaNotesopticcoating 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 taraNotesopticcoating optimization for AlGaAs:error analysis


   
        
            
 compare_indices.pngcompare_indices.figcompare_indices.png 
  1356   Thu Sep 26 23:25:40 2013 taraNotesopticcoating 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 taraNotesopticcoating 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 taraNotesopticcoating 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 taraNotesopticcoating optimization for AlGaAs:electric field in coating layerElectric 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 taraNotesopticcoating optimization for AlGaAs:variation in xI 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 taraNotesoptic photothermal noise in AlGaAsI revised the calculation for photo-thermal
noise in AlGaAs coatings, the photo thermal
noise should not be a limiting source.
 Int_cotings.pngInt_cotings.fig 
  1376   Wed Oct 30 01:56:38 2013 taraDailyProgressoptictable workI'm optimizing the setup, and clearing
the table a little bit.

    Self homodyne setup in
 oldPBS.jpgnewPBS.jpg 
  1379   Fri Nov 1 00:22:40 2013 taraDailyProgressopticmore optimizationI'm putting EOAM back on ACAV path. The
setup is roughly optimized.
(14.75 MHz) EOM , EOAM, quarter waveplate
 foam1.jpgfoam2.jpg 
  1385   Fri Nov 8 03:36:44 2013 taraDailyProgressopticredo- PMC pathI'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 taraDailyProgressopticredo- PMC pathPMC 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 taraNotesoptic photothermal noise in AlGaAs: thickness resolutionWe 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 taraPhotosopticpacking 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 taraNotesopticCoating TO opt for Adv LIGO: ETMHere is a prelim result
for AlGaAs TO opt for ETM coating.
 
 7x 
  1426   Sun May 18 10:45:42 2014 taraNotesopticCoating TO opt for Adv LIGOI did an optimized structure
for ITM and plotted the estimated noise budget
of AdvLIGO using optimized AlGaAs coating
 dOpt_ITM1.pngdOpt_ITM1.figAdvLIGO_AlGaAs.pngAdvLIGO_AlGaAs.fig 
  1437   Thu Jun 26 12:07:17 2014 EvanDailyProgressopticHWP adjustments; south lockingI 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, EvanNotesopticfiber phase noise measurement Installation of
optics for fiber phase noise measurement
 setup1.JPGsetup2.JPG 
  1449   Tue Jul 15 18:26:20 2014 taraDailyProgressopticsetting up scattered light measurementI'm setting up a scattered
light measurement for AlGaAs samples. The
methods are summarized below.
 photo.JPG 
  1452   Thu Jul 17 18:57:54 2014 taraDailyProgressopticsetting up scattered light measurementI'm testing the setup and
a code for extracting scattered light from
the images. 
 dark1.pnglight.pngresidual.pngscattered_.zip 
  1455   Wed Jul 23 00:28:14 2014 taraDailyProgressopticsetting up scattered light measurementI'm checking
the linearity of power and exposure on the
camera. The ccd counts are quite linear with
 exp_vs_light.pngpower.png 
  1456   Thu Jul 24 02:00:23 2014 taraDailyProgressopticsetting up scattered light measurementI rechecked the CCD response
vs exposure time and power. The results
are linear.
 power.pngphoto-1.JPGphoto-2.JPG 
  1457   Thu Jul 24 17:11:18 2014 EvanDailyProgressopticCalibration for scattered light measurement[Tara, Evan, Josh, et al.]
Today we did some characterization
and calibration of the scattered light apparatus.
 power.pdfccdCal.pdf10.pdf 
  1458   Fri Jul 25 08:12:40 2014 EvanDailyProgressopticCalibration for scattered light measurement

    

       
            
 ccdCal.pdf 
  1459   Fri Jul 25 14:21:34 2014 EvanDailyProgressopticCalibration for scattered light measurement

    

       
            
 cal.pdf 
  1460   Sun Jul 27 19:46:16 2014 EvanDailyProgressopticBRDF of AlGaAs mirror 137B1[Tara, Evan]
We replaced the Lambertian diffuser
with AlGaAs mirror 137B1. We intentionally
 ccdImage.pdf137brdf.pdf 
  1461   Tue Jul 29 11:40:09 2014 EvanDailyProgressopticBRDF of AlGaAs mirror 143[Tara, Evan]
Yesterday we took a scatter measurement
of AlGaAs mirror #143. Instead of one bright
 143brdf.pdf 
  1462   Wed Jul 30 17:47:56 2014 taraDailyProgressopticBRDF 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 EvanDailyProgressopticBRDF of AlGaAs mirror 114[Tara, Evan]
Tara took a BRDF measurement yesterday
of AlGaAs mirror #114.
 114brdf.pdf 
  1465   Mon Aug 4 15:23:06 2014 EvanDailyProgressopticBRDF of AlGaAs mirror 114 after cleaning[Tara, Evan]
Tara also took a BRDF measurement
of #114 after cleaning it.
 114_cleaned_brdf.pdf 
  1466   Tue Aug 5 08:14:14 2014 EvanDailyProgressopticBRDF of AlGaAs mirror 141 after cleaningIncident power: 20.0(1) mW
Exposure times used: 25 ms, 50 ms,
200 ms, 500 ms, 1000 ms
 141brdf.pdf 
  1467   Tue Aug 5 14:54:36 2014 EvanDailyProgressopticBRDF of AlGaAs mirror 132 after cleaning

    

       
            
 132brdf.pdf 
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