| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
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 |
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|
1358
|
Wed Oct 2 16:21:11 2013 |
Chloe | DailyProgress | ECDL | TEC Construction | Today Tara showed me where to find
isopropanol in order to clean the Peltier
element. After cleaning it carefully, the |
|
|
1357
|
Mon Sep 30 15:45:09 2013 |
Chloe | DailyProgress | ECDL | TEC Construction | Today I tried to calibrate the PID
gain for the TEC controller. I noticed some
connections needed repairing to I resoldered |
|
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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 |
|
1355
|
Wed Sep 25 12:23:25 2013 |
Evan | DailyProgress | RefCav | CCD camera for monitoring refl beam | OK, I borrowed a Watec from the ATF. It
is more sensitive than the jWin I was using,
but judging by the graininess we appear to |
|
|
1354
|
Wed Sep 25 10:15:49 2013 |
rana | DailyProgress | RefCav | CCD camera for monitoring refl beam |
No (as I already told Tara).
The PD reflection is distorted and |
|
|
1353
|
Tue Sep 24 20:28:47 2013 |
Evan | DailyProgress | RefCav | CCD camera for monitoring refl beam | I placed a CCD camera behind the steering
mirror directly before the south RFPD in
the hopes of getting a handle on the shape |
|
|
1352
|
Tue Sep 24 11:12:49 2013 |
Evan | DailyProgress | ISS | North EOAM: broken? | Last week I talked to an engineer at Newport,
and he agreed that the discrepancy (1 µW/V
versus 30 µW/V) seemed unusual. Tara |
|
|
1351
|
Mon Sep 23 18:50:05 2013 |
tara | Notes | optic | coating optimization for AlGaAs:error analysis |
|
|
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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 |
|
|
1349
|
Mon Sep 23 11:57:13 2013 |
Evan | DailyProgress | RF | South PDH loop phase adjustment | I removed 29 cm of SMA cable between the
south RFPD RF output and the south TTFSS
PD input in order to make the PDH error signal |
|
|
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 |
|
|
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. |
|
|
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. |
|
|
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, |
|
|
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 |
|
|
1343
|
Thu Sep 19 18:09:18 2013 |
tara | Summary | NoiseBudget | Coating Thermal Noise Calculator |
|
|
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1342
|
Thu Sep 19 14:55:11 2013 |
tara | Summary | NoiseBudget | Coating Thermal Noise Calculator |
|
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|
1341
|
Thu Sep 19 10:42:59 2013 |
Evan | DailyProgress | Electronics Equipment | PDH loop noise | Yesterday I measured the noise of the refcav
PDH loops. Because of RFAM effects, possible
nonlinearity in the RFPD response, etc., |
|
|
1340
|
Wed Sep 18 21:55:11 2013 |
tara | Notes | optic | coating optimization for AlGaAs:error analysis |
Optimized coatings structure.
|
|
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1339
|
Wed Sep 18 18:19:52 2013 |
Evan | DailyProgress | RF | Measurement of PDH modulation depths | I took measurements of the carrier and
sideband power transmitted through each cavity
in order to get the modulation depth Γ |
|
|
1338
|
Tue Sep 17 19:43:45 2013 |
tara | Summary | NoiseBudget | Coating Thermal Noise Calculator |
|
|
|
1337
|
Fri Sep 13 13:40:43 2013 |
rana | Summary | NoiseBudget | Coating Thermal Noise Calculator | combined PDFs with pdftk:
pdftk *.pdf cat output MattThermal.pdf
and saved as PDF-X for thumbnail |
|
|
1336
|
Thu Sep 12 18:12:26 2013 |
Matt A. | Summary | NoiseBudget | Coating Thermal Noise Calculator | As part
of checking Tara's code for optimizing the
coating structure to reduce thermo-optic |
6x |
|
1335
|
Thu Sep 12 11:04:17 2013 |
Evan | DailyProgress | ISS | North EOAM: broken? | Neither Tara nor I can get the north New
Focus 4104 to put out a significant amount
of power modulation, despite going through |
|
|
1334
|
Wed Sep 11 18:29:40 2013 |
Evan | DailyProgress | Environment | Extreme Makeover: CTN Edition | [Tara, Evan]
In preparation for tomorrow's sprinkler
installation, we have removed any extraneous |
|
|
1333
|
Wed Sep 11 00:07:04 2013 |
Evan | DailyProgress | ISS | Beefier ISS loop |
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|
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1332
|
Tue Sep 10 04:53:34 2013 |
tara | DailyProgress | NoiseBudget | RIN induced TO noise in beat | The cause of the peaks around 1kHz in RIN
is solved, PMC is the reason. After damping
it, the peaks disappears. |
|
|
1331
|
Mon Sep 9 21:19:24 2013 |
tara | DailyProgress | NoiseBudget | RIN induced TO noise in beat | I'm trying to understand the measured RIN
in the setup. The evidence suggests that
the measured RIN in 100Hz- 6kHz, is real |
|
|
1330
|
Mon Sep 9 15:00:19 2013 |
Evan | DailyProgress | ISS | Beefier ISS loop | I made a quick inverting op-amp integrator
which kicks in at 860 Hz at has gain 10 at
infinity. The feedback is a 5.6 kΩ |
|
|
1329
|
Mon Sep 9 02:27:46 2013 |
tara | DailyProgress | NoiseBudget | RIN induced TO noise in beat | The measured RIN is measured and converted
to frequency noise via photo thermal effect
then compared to beat. The effect seems to |
6x |
|
1328
|
Sat Sep 7 12:38:49 2013 |
Evan | DailyProgress | ISS | Simple ISS with SR560 - frequency noise coupling | I've taken the above RIN data and combined
it with the intensity-to-frequency TF in
PSL:1316 |
|
|
1327
|
Sat Sep 7 04:29:32 2013 |
tara | DailyProgress | NoiseBudget | beat | Short note from tonight measurement:
1) scattered bump from dc to 100Hz
is mostly from seismic. It is worse during |
|
|
1326
|
Thu Sep 5 10:52:27 2013 |
Evan | DailyProgress | ISS | Simple ISS with SR560 | At Tara's suggestion, I implemented a simple
ISS by feeding the output of the PDA10CS
into an SR560 (ac-coupled) with some gain, |
|
|
1325
|
Thu Sep 5 08:05:35 2013 |
Evan | DailyProgress | ISS | South EOAM calibration for 0.78 mW of output power | I used the black voltage calibrator to
give the south EOAM a DC voltage, and then
used the ThorLabs power meter to read off |
|
|
1324
|
Wed Sep 4 18:40:00 2013 |
rana | DailyProgress | NoiseBudget | Seismic Noise Coupling |
|
|
|
1323
|
Tue Sep 3 09:52:17 2013 |
rana | DailyProgress | NoiseBudget | Seismic Noise Coupling | Can you please explain how the seismic
noise coupling is estimated for the noise
budget? |
|
|
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. |
|
|
1321
|
Mon Sep 2 03:38:27 2013 |
tara | DailyProgress | NoiseBudget | beat | It's a quiet night, so I went down the
lab to measure the beat signal. We are getting
close. I think I have to review my noise |
|
|
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 |
|
1319
|
Thu Aug 29 13:25:49 2013 |
tara | DailyProgress | Vacuum | pumping down the chamber | The turbo pump is removed, and the ion
pump is on. The initial value is ~7mA.
I removed the turbo pump and turn |
|
|
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 |
|
|
1317
|
Wed Aug 28 20:19:44 2013 |
tara | Notes | EOM | EOM driver: modification | We modified the EOM driver, so that the
resonant frequency is now~ 14.75MHz. The
full test will be done later. |
|
|
1316
|
Wed Aug 28 11:13:07 2013 |
Evan | DailyProgress | BEAT | Intensity-to-frequency transfer function | [Tara, Evan]
Last week we tried measuring a transfer
function which takes intensity fluctuation |
|
|
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 |
|
1314
|
Tue Aug 27 15:45:28 2013 |
Evan | DailyProgress | Seismic | Resonances of the seismic isolation stack | [Tara, Koji, Evan]
On Friday when the vacuum chamber
was open, we took some impulse response measurements |
|
|
1313
|
Sat Aug 24 15:42:54 2013 |
tara | DailyProgress | Vacuum | pumping down the chamber | I closed the chamber. The turbo pump is
on and pumping down.
I realigned the beams so the |
|
|
1312
|
Fri Aug 23 19:00:13 2013 |
Evan | DailyProgress | RefCav | No more reflection overlap | [Tara, Evan]
Tara and I opened the CTN vacuum
can this afternoon. Previously, the reflection |
|
|
1311
|
Thu Aug 22 20:31:28 2013 |
tara | DailyProgress | NoiseBudget | installed EOAM | The bump at 2kHz in the beat signal that
I saw before was also from RFAM. By adjusting
the 1/2 waveplate in front of the sideband |
|
|
1310
|
Thu Aug 22 13:36:19 2013 |
tara | DailyProgress | NoiseBudget | Transfer Functions (RIN to Frequency noise via photothermal) | I went through all the code with
Evan and found another mistake. This time
the code should be correct, and the result |
|