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ID Date Author Type Category Subject Text Attachments
  1307   Tue Aug 20 20:10:01 2013 taraDailyProgressBEATnoise huntingNoise hunting is in progress. Today I identified
that scattered light from the window is one
of the problem.
 beat_2013_08_20.png 
  1306   Sun Aug 18 15:06:29 2013 ChloeDailyProgressECDLSURF Presentation Newest version on the SVN with the
latest data and Tara's commentary from my
practice presentation. I'll probably end
  
  1305   Fri Aug 16 22:05:27 2013 taraDailyProgressBEATnoise hunting Noise hunting is in progress, I checked
the error noise from ACAV and RCAV loops
and compared them to the beat. The beat is
 nb_short_cav.pngnb_short_cav.figbeat_psd.jpg 
  1304   Fri Aug 16 19:43:01 2013 ChloeDailyProgressECDLFree Running Noise of Bare Laser Diode Today Tara and I worked on getting
a noise measurement for the bare laser diode
using a Michelson interferometer with different
 michelsonsetup.jpg1cm_and_5cm.png 
  1303   Fri Aug 16 15:11:32 2013 EricaNotesfiber opticNoise Budget for 60m fiber   NoiseBudget.pngNoiseBudget.fig 
  1302   Fri Aug 16 10:40:20 2013 EricaDailyProgressfiber opticSpectra Data Locked and Unlocked Laser Tara improved the alignment so we
got a little over 1V coming from the fiber
alone. We took another run of data of the
 0815error.png0815error.fig 
  1301   Fri Aug 16 10:35:44 2013 EricaNotesElectronics EquipmentAD590 msrmt, conversion to freq noiseTuesday:

I added sockets to the ends of the wire to
  
  1300   Fri Aug 16 04:35:58 2013 taraDailyProgressNoiseBudgetTransfer Functions (RIN to Frequency noise via photothermal)I estimated the requirement for laser RIN
for AlGaAs coatings. The result is a factor
of 5 more stringent from what we need for
 RIN_req_algaas.pngRIN_req_algaas.fig 
  1299   Thu Aug 15 18:53:45 2013 ChloeDailyProgressECDLAssembling ECDL

    

       
            
 100_0104.JPG 
  1298   Tue Aug 13 21:45:51 2013 taraDailyProgressNoiseBudgetTransfer Functions (RIN to Frequency noise via photothermal)I rechecked the TF between power fluctuation
and frequency noise in beat measurement that
I did last year. The estimated result agrees
 farsi_2013_08_13.pngfarsi_2013_08_13.figRIN_TO_algaas.pngRIN_TO_algaas.fig 
  1297   Tue Aug 13 18:13:35 2013 ChloeDailyProgressECDLAssembling ECDLMade some modifications to the Solidworks
design. All of these have been changed on
the SVN. 
  
  1296   Tue Aug 13 12:39:36 2013 EricaDailyProgressfiber opticrewrote calculations for converting from voltage noise to frequency noiseThe equation for voltage is derived here:
[URL=http://nodus.ligo.caltech.edu:8080/PSL_Lab/1241]1241[/URL]
 P1030458.JPGP1030459.JPGP1030460.JPG 
  1295   Tue Aug 13 12:28:20 2013 EricaNotesElectronics Equipmentnew AD 590 circuit and its noise calculation, beam alignmentAttached are noise calculations for a new
circuit for the AD590.  
 P1030461.JPGP1030454.JPGP1030456.JPGP1030457.JPGAD590circuit2.PNG 
  1294   Mon Aug 12 18:21:03 2013 ChloeDailyProgressECDLSURF Presentation Tara would like me to present at
the SURF Seminar Day in August (either on
the LIGO field trip to the Livingston Observatory
  
  1293   Sat Aug 10 00:49:20 2013 taraNotesNoiseBudgetThermo-refractive noise in substrateI wrote a code to calculate thermo-refractive
noise in a finite-sized cylindrical substrate
as given in Heinert etal 2011. The noise
 getTRsub.m.zipTR_sub.pngTR_sub.fig 
  1292   Fri Aug 9 18:01:47 2013 ChloeDailyProgressECDLAssembling ECDL I spent awhile reading about PID
controllers in order to understand how to
tune the TEC. P represents proportional gains,
 cool_bridge2.PNGheat_bridge2.PNG 
  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 
  1290   Fri Aug 9 16:00:14 2013 taraNotesNoiseBudgetnoise huntingI measured the slope of the error signal
for ACAV path to be 200 kHz/V. This will
  
  1289   Thu Aug 8 18:43:44 2013 ChloeDailyProgressECDLAssembling ECDL Today I designed a better circuit
to measure the TEC's response with the oscilloscope.
It is called a bridge circuit, and allows
 100_0081.JPGcool_bridge.PNGheat_bridge.PNG 
  1288   Thu Aug 8 18:31:14 2013 EvanDailyProgressISSCTN ISS plant transfer functionTara and I have taken a measurement of
the transfer function which takes volts the
EOAM and produces volts at the ISS PD.
 eoamtopd.pdfeoamtopd_data.zip 
  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.
  
  1286   Wed Aug 7 18:53:20 2013 EricaDailyProgressfiber opticnoise budget, Matlab notes.[IMG]elog:1286/1[/IMG]

 noise_budget.PNGP1030427.JPG 
  1285   Wed Aug 7 18:13:21 2013 ChloeDailyProgressECDLAssembling ECDL

    

       
            
  
  1284   Wed Aug 7 13:27:00 2013 EricaDailyProgressfiber opticmore foam, calculations for convertion from voltage to frequencyaugust 6, 2013

 P1030409.JPGP1030417.JPGP1030420.JPG 
  1283   Tue Aug 6 19:48:19 2013 ChloeDailyProgressECDLAssembling ECDL I calculated a way to convert our
spectrum measurement of voltage from the
photodiode to the frequency noise of the
 100_0079.JPG 
  1282   Tue Aug 6 12:31:24 2013 EricaDailyProgressfiber opticinsulating foamWhen we turned the laser back on today, the
signal was oscillating pretty quickly. We
taped white insulating
 P1030403.JPG 
  1281   Mon Aug 5 18:47:04 2013 ChloeDailyProgressECDLAssembling ECDL I brought in a different USB drive
to get data off of the oscilloscope. It took
awhile to figure out how to capture the data
 heating.PNGcooling.PNGnoise_beginning.JPG 
  1280   Mon Aug 5 12:42:51 2013 EricaNotesfiber opticComponentsFiber:
60m long
1064 nm PM FC/APC Patch Cable: Panda
  
  1279   Mon Aug 5 12:21:00 2013 EricaNotesfiber opticcalculation: phase change for fiber[IMG]elog:1279/2[/IMG]

I'm not sure of the exact material of the
 130805-121449.jpg 
  1278   Mon Aug 5 11:42:50 2013 EvanNotesISSRIN requirement for 1.45" cavities with 2 mWThe ISS transfer function requirement is
not complete without giving the plant transfer
function, i.e., the conversion factors that
 iss_topology.jpg 
  1277   Fri Aug 2 18:15:06 2013 ChloeDailyProgressECDLAssembling ECDLToday I calibrated the PID gain on the
TEC. In order to do this, I used a silicone
heat sink compound to help the thermal conductivity
 possible_tec_mount.PNG 
  1276   Fri Aug 2 12:38:41 2013 taraDailyProgressfiber opticinsulating foamI turned off the hepa fans over the table
over the night. I came back this morning
and the temperature (measured on the vacuum
 chmbrtmp.JPGfringe.JPG 
  1275   Fri Aug 2 12:18:16 2013 taraDailyProgressBEATsearching for beatFound the beat @ 116 MHz. RCAV SLOW =5.762V,
ACAV SLOW = 1.209 V. 
 beat_2012_08_02.JPGnb_short_cav.png 
  1274   Thu Aug 1 21:19:57 2013 taraDailyProgressBEATsearching for beatI locked both cavities and trying to search
for the beat signal, I have not succeeded
yet.
  
  1273   Thu Aug 1 18:33:12 2013 ChloeDailyProgressECDLAssembling ECDLToday I tried to set up the TEC on the
actual assembly. When doing so, Tara pointed
out that I needed to have a separate temperature
 tempsensor.PNG 
  1272   Thu Aug 1 03:34:35 2013 ChloeDailyProgressECDLAssembling ECDLToday I worked on updating my progress
report and abstract. Posted to the SVN. 
Our machined parts were finished
  
  1271   Thu Aug 1 00:25:02 2013 EricaDailyProgressfiber opticinsulating foam7/30-31/13

Wrote progress report
 731_7graph.PNG731_11graph.PNGP1030318.JPG 
  1270   Wed Jul 31 01:34:56 2013 EvanNotesISSRIN requirement for 1.45" cavities with 2 mWThis is an estimate of the required RIN
for the CTN experiment, so that Chas can
set the appropriate loop gain and shape for
 intensity_frequency_trans.pdfrin_requirement.pdfrin_2013-07-30.zip 
  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
  
  1268   Tue Jul 30 17:55:21 2013 ChloeNotesECDLCurrent Driver/TECI fixed the solder joints on the TEC by
using heat shrink to make sure nothing short
circuits. I figured it would be cautious
 working!.jpg 
  1267   Tue Jul 30 16:19:32 2013 EricaNotesfiber opticsetup for beam recombinationDiagram for newest setup with additional half
wave and lenses: 
[IMG]elog:1267/2[/IMG][IMG]elog:1267/1[/IMG]
 new_setup.PNGbeam_recombination2.PNG 
  1266   Tue Jul 30 15:48:47 2013 EricaDailyProgressfiber opticnoise for GYRO[quote]

  
  1265   Tue Jul 30 12:23:41 2013 EricaDailyProgressBEATaddressed noise problem, DC signaljuly 29, 2913

Worked on progress report due Friday.
  
  1264   Tue Jul 30 00:01:22 2013 EvanDailyProgressISSRelative intensity noise with south cavity lockedChas has been building an ISS and needs
a spec for  suppression of relative intensity
noise for Tara's 1.45″ silica/tantala
 rin_southcav.pdfrin_2013-07-29_data_code.zip 
  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 
  1262   Mon Jul 29 19:06:31 2013 ChloeNotesECDLCurrent Driver/TEC 
I worked on my SURF progress report
and abstract (due Friday, August 2). The
  
  1261   Mon Jul 29 13:30:26 2013 EricaDailyProgressBEATadding resistor, capacitor, and socketsJuly 26, 2013

Was able to place the 24k ohm resistor in
 w_o_capacitor_7_26_13.JPGcapacitor_7_26_13.JPGP1030066.JPGP1030070.JPG 
  1259   Fri Jul 26 17:51:02 2013 ChloeNotesECDLCurrent Driver/TECI figured out how to calibrate the potentiometers
for the TEC. The three potentiometers (labeled
P, I, and D) control how quickly the TEC
  
  1258   Fri Jul 26 11:45:28 2013 EricaDailyProgressBEATcircuit for measuring temperature fluctations on CTN tableJuly 25, 2013

finished building the circuit today.  Had
  
  1257   Fri Jul 26 11:22:45 2013 EricaDailyProgressBEATcircuit for measuring temperature fluctations on CTN tableJuly 24, 2013

Took the tour to JPL today.  Got to see the
  
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