| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
1309
|
Thu Aug 22 00:29:32 2013 |
tara | DailyProgress | NoiseBudget | installed EOAM | I installed an electro-optic amplitude
modulator (EOAM) in RCAV path. Better optimization
will be needed to reduce extra noise. |
|
|
1308
|
Wed Aug 21 16:03:13 2013 |
Evan | DailyProgress | ISS | New RIN and EOAM measurements for ISS | After some discussion with Tara and David,
it became apparent that it would be wise
to take RIN noise and EOAM-to-PD transfer |
|
|
1307
|
Tue Aug 20 20:10:01 2013 |
tara | DailyProgress | BEAT | noise hunting | Noise hunting is in progress. Today I identified
that scattered light from the window is one
of the problem. |
|
|
1306
|
Sun Aug 18 15:06:29 2013 |
Chloe | DailyProgress | ECDL | SURF 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 |
tara | DailyProgress | BEAT | noise 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 |
|
|
1304
|
Fri Aug 16 19:43:01 2013 |
Chloe | DailyProgress | ECDL | Free 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 |
|
|
1303
|
Fri Aug 16 15:11:32 2013 |
Erica | Notes | fiber optic | Noise Budget for 60m fiber | |
|
|
1302
|
Fri Aug 16 10:40:20 2013 |
Erica | DailyProgress | fiber optic | Spectra 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 |
|
|
1301
|
Fri Aug 16 10:35:44 2013 |
Erica | Notes | Electronics Equipment | AD590 msrmt, conversion to freq noise | Tuesday:
I added sockets to the ends of the wire to |
|
|
1300
|
Fri Aug 16 04:35:58 2013 |
tara | DailyProgress | NoiseBudget | Transfer 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 |
|
|
1299
|
Thu Aug 15 18:53:45 2013 |
Chloe | DailyProgress | ECDL | Assembling ECDL |
|
|
|
1298
|
Tue Aug 13 21:45:51 2013 |
tara | DailyProgress | NoiseBudget | Transfer 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 |
|
|
1297
|
Tue Aug 13 18:13:35 2013 |
Chloe | DailyProgress | ECDL | Assembling ECDL | Made some modifications to the Solidworks
design. All of these have been changed on
the SVN. |
|
|
1296
|
Tue Aug 13 12:39:36 2013 |
Erica | DailyProgress | fiber optic | rewrote calculations for converting from voltage noise to frequency noise | The equation for voltage is derived here:
[URL=http://nodus.ligo.caltech.edu:8080/PSL_Lab/1241]1241[/URL] |
|
|
1295
|
Tue Aug 13 12:28:20 2013 |
Erica | Notes | Electronics Equipment | new AD 590 circuit and its noise calculation, beam alignment | Attached are noise calculations for a new
circuit for the AD590.
|
|
|
1294
|
Mon Aug 12 18:21:03 2013 |
Chloe | DailyProgress | ECDL | SURF 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 |
tara | Notes | NoiseBudget | Thermo-refractive noise in substrate | I wrote a code to calculate thermo-refractive
noise in a finite-sized cylindrical substrate
as given in Heinert etal 2011. The noise |
|
|
1292
|
Fri Aug 9 18:01:47 2013 |
Chloe | DailyProgress | ECDL | Assembling ECDL | I spent awhile reading about PID
controllers in order to understand how to
tune the TEC. P represents proportional gains, |
|
|
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. |
|
|
1290
|
Fri Aug 9 16:00:14 2013 |
tara | Notes | NoiseBudget | noise hunting | I 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 |
Chloe | DailyProgress | ECDL | Assembling ECDL | Today I designed a better circuit
to measure the TEC's response with the oscilloscope.
It is called a bridge circuit, and allows |
|
|
1288
|
Thu Aug 8 18:31:14 2013 |
Evan | DailyProgress | ISS | CTN ISS plant transfer function | Tara and I have taken a measurement of
the transfer function which takes volts the
EOAM and produces volts at the ISS PD. |
|
|
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. |
|
|
1286
|
Wed Aug 7 18:53:20 2013 |
Erica | DailyProgress | fiber optic | noise budget, Matlab notes. | [IMG]elog:1286/1[/IMG]
|
|
|
1285
|
Wed Aug 7 18:13:21 2013 |
Chloe | DailyProgress | ECDL | Assembling ECDL |
|
|
|
1284
|
Wed Aug 7 13:27:00 2013 |
Erica | DailyProgress | fiber optic | more foam, calculations for convertion from voltage to frequency | august 6, 2013
|
|
|
1283
|
Tue Aug 6 19:48:19 2013 |
Chloe | DailyProgress | ECDL | Assembling ECDL | I calculated a way to convert our
spectrum measurement of voltage from the
photodiode to the frequency noise of the |
|
|
1282
|
Tue Aug 6 12:31:24 2013 |
Erica | DailyProgress | fiber optic | insulating foam | When we turned the laser back on today, the
signal was oscillating pretty quickly. We
taped white insulating
|
|
|
1281
|
Mon Aug 5 18:47:04 2013 |
Chloe | DailyProgress | ECDL | Assembling 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 |
|
|
1280
|
Mon Aug 5 12:42:51 2013 |
Erica | Notes | fiber optic | Components | Fiber:
60m long
1064 nm PM FC/APC Patch Cable: Panda |
|
|
1279
|
Mon Aug 5 12:21:00 2013 |
Erica | Notes | fiber optic | calculation: phase change for fiber | [IMG]elog:1279/2[/IMG]
I'm not sure of the exact material of the |
|
|
1278
|
Mon Aug 5 11:42:50 2013 |
Evan | Notes | ISS | RIN requirement for 1.45" cavities with 2 mW | The ISS transfer function requirement is
not complete without giving the plant transfer
function, i.e., the conversion factors that |
|
|
1277
|
Fri Aug 2 18:15:06 2013 |
Chloe | DailyProgress | ECDL | Assembling ECDL | Today 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 |
|
|
1276
|
Fri Aug 2 12:38:41 2013 |
tara | DailyProgress | fiber optic | insulating foam | I turned off the hepa fans over the table
over the night. I came back this morning
and the temperature (measured on the vacuum |
|
|
1275
|
Fri Aug 2 12:18:16 2013 |
tara | DailyProgress | BEAT | searching for beat | Found the beat @ 116 MHz. RCAV SLOW =5.762V,
ACAV SLOW = 1.209 V. |
|
|
1274
|
Thu Aug 1 21:19:57 2013 |
tara | DailyProgress | BEAT | searching for beat | I locked both cavities and trying to search
for the beat signal, I have not succeeded
yet. |
|
|
1273
|
Thu Aug 1 18:33:12 2013 |
Chloe | DailyProgress | ECDL | Assembling ECDL | Today 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 |
|
|
1272
|
Thu Aug 1 03:34:35 2013 |
Chloe | DailyProgress | ECDL | Assembling ECDL | Today 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 |
Erica | DailyProgress | fiber optic | insulating foam | 7/30-31/13
Wrote progress report
|
|
|
1270
|
Wed Jul 31 01:34:56 2013 |
Evan | Notes | ISS | RIN requirement for 1.45" cavities with 2 mW | This is an estimate of the required RIN
for the CTN experiment, so that Chas can
set the appropriate loop gain and shape for |
|
|
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 |
|
|
1268
|
Tue Jul 30 17:55:21 2013 |
Chloe | Notes | ECDL | Current Driver/TEC | I fixed the solder joints on the TEC by
using heat shrink to make sure nothing short
circuits. I figured it would be cautious |
|
|
1267
|
Tue Jul 30 16:19:32 2013 |
Erica | Notes | fiber optic | setup for beam recombination | Diagram for newest setup with additional half
wave and lenses:
[IMG]elog:1267/2[/IMG][IMG]elog:1267/1[/IMG] |
|
|
1266
|
Tue Jul 30 15:48:47 2013 |
Erica | DailyProgress | fiber optic | noise for GYRO | [quote]
|
|
|
1265
|
Tue Jul 30 12:23:41 2013 |
Erica | DailyProgress | BEAT | addressed noise problem, DC signal | july 29, 2913
Worked on progress report due Friday.
|
|
|
1264
|
Tue Jul 30 00:01:22 2013 |
Evan | DailyProgress | ISS | Relative intensity noise with south cavity locked | Chas has been building an ISS and needs
a spec for suppression of relative intensity
noise for Tara's 1.45″ silica/tantala |
|
|
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 |
|
|
1262
|
Mon Jul 29 19:06:31 2013 |
Chloe | Notes | ECDL | Current Driver/TEC |
I worked on my SURF progress report
and abstract (due Friday, August 2). The |
|
|
1261
|
Mon Jul 29 13:30:26 2013 |
Erica | DailyProgress | BEAT | adding resistor, capacitor, and sockets | July 26, 2013
Was able to place the 24k ohm resistor in |
|
|
1259
|
Fri Jul 26 17:51:02 2013 |
Chloe | Notes | ECDL | Current Driver/TEC | I figured out how to calibrate the potentiometers
for the TEC. The three potentiometers (labeled
P, I, and D) control how quickly the TEC |
|