| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
2794
|
Mon Apr 12 20:48:51 2010 |
Aidan, Mott | Summary | Green Locking | Temperature sweep of the Innolight: df/dT ~ 3.3GHz/K |
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|
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2797
|
Tue Apr 13 12:39:51 2010 |
Aidan, Mott | Summary | Green Locking | Temperature sweep of the Innolight: df/dT ~ 3.3GHz/K | Please put those numbers onto wiki somewhere
at the green page or laser characterization
page. |
|
|
4441
|
Thu Mar 24 19:48:13 2011 |
Aidan, Kiwamu | Update | Green Locking | Designs for permanent electronics for ALS | Kiwamu and I looked at all the electronics
that are currently in place for the green
locking on the X-arm and have made a set |
|
|
4471
|
Wed Mar 30 21:43:31 2011 |
Aidan, Kiwamu | Summary | Green Locking | Calculation of the green contrast on the RF PD | Skip to final thought ...
Kiwamu and I have set about measuring
the contrast of the signal on the RF PD. |
|
|
4472
|
Wed Mar 30 21:46:10 2011 |
Aidan, Kiwamu | Update | Green Locking | States of the Green beat note | The attached table shows the amplitude
of the green beat note when the end laser
was in various states. We can increase the |
|
|
3096
|
Tue Jun 22 09:45:21 2010 |
Aidan, Joe, Razib | Update | Phase Camera | Current phase camera setup. Seeing Acoustic beat | We've set up a preliminary test bed
for the phase camera. It simply uses a HeNe
that is split into two beams. One is frequency |
|
|
4213
|
Thu Jan 27 17:12:02 2011 |
Aidan, Joe | Summary | Green Locking | Digital Frequency to Amplitude converter | Joe and I built a very simple digital frequency
to amplitude converter using the RCG. The
input from an ADC channel goes through a |
|
|
4218
|
Fri Jan 28 10:27:46 2011 |
Aidan, Joe | Summary | Green Locking | Digital Frequency Discriminator - calibration | One more thing ... we can calibrate
the output of the LP filter to give a result
in Hz with the following calibration: |
|
|
4401
|
Thu Mar 10 16:00:53 2011 |
Aidan, Joe | Update | Green Locking | Intensity stabilization loop using beatnote DC. | Aidan: Joe and I have added a channel that
takes the DC output from the vertex beatnote
PD and sends it, via RFM, to a DAC at the |
|
|
2835
|
Fri Apr 23 18:30:49 2010 |
Aidan, Jenne, Koji | Summary | Green Locking | Green means GO! | Jenne, Koji and I assembled the Covesion
Oven today, inserted a PPKTP crystal from
Raicol, aligned the crystal to a 50mW focus |
|
|
4521
|
Wed Apr 13 23:32:07 2011 |
Aidan, Jamie | Configuration | LSC | AS PD and Camera installed | I spent some time tracking down the AS
beam which had vanished from the AP table.
Eventually, by dramatically mis-aligning |
|
|
4536
|
Fri Apr 15 22:57:38 2011 |
Aidan, Jamie | Configuration | LSC | AS PD and Camera installed | AS port ITMX YAW range where AS beam
was visible = [-1.505, -1.225] - these extrema
put the beam just outside of some aperture |
|
|
4534
|
Fri Apr 15 22:54:20 2011 |
Aidan, Bryan | Update | Green Locking | Beat note amplitude on Vertex PD | I was investigating the beat note amplitude
on the vertex PD again yesterday. The incident
power on the PD was 150uW in the PSL green |
|
|
742
|
Sat Jul 26 15:09:57 2008 |
Aidan | Update | Computers | Reboot of op440m |
I was reviewing the PSL Overview screen this
afternoon and op440m completely froze when |
|
|
1205
|
Mon Dec 29 18:01:07 2008 |
Aidan | Update | Auxiliary locking | Updated 40m Upgrade Document T080074-00-R |
Added a paragraph to the 40m Upgrade document
describing the fiber stabilization and frequency |
|
|
1687
|
Fri Jun 19 13:39:29 2009 |
Aidan | Update | General | Upper limit measurement of the scatter from the eLIGO beam dumps. |
|
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|
1782
|
Thu Jul 23 07:34:45 2009 |
Aidan | Update | CDS | Added C2 MEDM screens to 40m SVN. |
See Adhikari eLOG entry: http://nodus.ligo.caltech.edu:8080/AdhikariLab/194 |
|
|
2792
|
Mon Apr 12 17:48:32 2010 |
Aidan | Update | Computer Scripts / Programs | elog restarted | The elog crashed when I was uploading
a photo just now. I logged into nodus and
restarted it. |
|
|
2793
|
Mon Apr 12 19:50:30 2010 |
Aidan | Summary | Green Locking | Temperature sweep of the Lightwave: df/dT = 2.8GHz/K | The beams from the Innolight and Lightwave
NPROs were both incident on a 1GHZ New Focus
PD. Mott and I swept the temperature of the |
|
|
2807
|
Mon Apr 19 11:31:04 2010 |
Aidan | Update | Green Locking | 1W NPRO output profile |
|
|
|
2809
|
Mon Apr 19 16:27:13 2010 |
Aidan | Update | Green Locking | Raicol crystals arrived and we investigated them | Jenne, Koji and I opened up the package
from Raicol and examined the crystals under
the microscope. The results were mixed and |
|
|
2816
|
Tue Apr 20 11:14:31 2010 |
Aidan | Update | Green Locking | Raicol crystals arrived and we investigated them |
Here
is Crystal 724 polished side 2 with all photos |
|
|
2910
|
Tue May 11 14:39:17 2010 |
Aidan | Update | Green Locking | Green Laser Beam Profile |
Here's a photo of the set-up
used. The beam profile is measured relative |
|
|
2951
|
Wed May 19 14:36:46 2010 |
Aidan | HowTo | Phase Camera | Phase Camera algorithm and stuff | I had a think about the algorithm
we might use for the phase camera measurement.
MATLAB has an fft function that will allow |
|
|
2955
|
Thu May 20 10:06:56 2010 |
Aidan | HowTo | Phase Camera | Phase Camera- raw data video | |
|
|
2995
|
Wed May 26 18:54:55 2010 |
Aidan | Summary | Green Locking | Mounted Crystal 724 in the Doubling Oven | Andri and I mounted the Raicol Crystal
#724 in one of the new Covesion Ovens. The
procedure was the same as before - see |
|
|
2998
|
Thu May 27 08:22:57 2010 |
Aidan | Update | Computers | Restarted the elog this morning | |
|
|
3082
|
Wed Jun 16 18:14:13 2010 |
Aidan | Update | General | Glass cover from overhead light smashed on PSL table | I was giving a tour of the 40m yesterday.
We were looking at the PSL table. About 30
seconds after I turned the lights on a glass |
|
|
3113
|
Thu Jun 24 06:49:29 2010 |
Aidan | Update | Green Locking | a channel for PPKTP temperature | Is this a setpoint temperature that we
can change by writing to the channel or is
it a readout of the actual temperature of |
|
|
3421
|
Fri Aug 13 15:29:35 2010 |
Aidan | Frogs | Photos | Here's the 40m team | |
|
|
3756
|
Thu Oct 21 19:10:39 2010 |
Aidan | Update | PSL | Found the beat at 1064nm | |
|
|
3766
|
Fri Oct 22 21:28:27 2010 |
Aidan | Update | Locking | Green era: found a green beat note finally | Nice work!
|
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|
3907
|
Fri Nov 12 11:36:06 2010 |
Aidan | Configuration | Computers | Fixed the PERL PATH errors from the scripts directory change | I've been trying to get a PID loop
running for the green locking and I've discovered
that some of the directories in the path |
|
|
3908
|
Fri Nov 12 12:06:11 2010 |
Aidan | Configuration | Green Locking | PID script working - now it needs to be tuned | I've set up a PID script that senses
the EX-PSL Green Beat note (from the frequency
counter) and actuates on the temperature |
|
|
3922
|
Mon Nov 15 14:42:01 2010 |
Aidan | Update | PSL | C1PSL rebooted? | Yeah. Joe and I rebooted c1psl a couple
of times this morning. I didn't realize the
burtrestore wasn't automatic. |
|
|
3930
|
Tue Nov 16 09:02:54 2010 |
Aidan | Update | Green Locking | PID loop - calibration of SR620 output | [Aidan, Kiwamu]
Kiwamu and I roughly calibrated the
analogue output from the SR620 frequency |
|
|
3931
|
Tue Nov 16 10:47:45 2010 |
Aidan | Update | Green Locking | Rebooted c1psl - added new GRNBEAT_FREQ channel | I restored C1:PSL-126MOPA_126MON to its
original settings (EGUF = -410, EGUL = 410)
and added a new calc channel called C1:LSC-EX_GRNBEAT_FREQ |
|
|
3932
|
Tue Nov 16 12:47:30 2010 |
Aidan | Update | Green Locking | PID loop but no green | The PID loop is ready to be run on the
green beat note but, since the tanks are
open, there is no green transmission from |
|
|
3934
|
Tue Nov 16 16:00:26 2010 |
Aidan | Update | Green Locking | PID loop but no green |
|
|
|
4040
|
Fri Dec 10 09:58:57 2010 |
Aidan | Update | SUS | beam pointing has been done | Good news. I feel multi-chromatic-locking
success is just around the corner.
By the way, there's a new presentation |
|
|
4177
|
Thu Jan 20 15:39:59 2011 |
Aidan | Update | Locking | Upper limit on frequency noise of ADC | [Aidan, Kiwamu]
Kiwamu and I plugged the output from
a DS3456 function generator into the ADC |
|
|
4178
|
Thu Jan 20 17:00:39 2011 |
Aidan | Configuration | Locking | Ballpark figures for Green Locking PLLs (Digital vs Analogue) | If we use a digital PLL for locking the
frequency of the PSL and END green lasers
then we can expect a UGF of around 1kHz (assuming |
|
|
4182
|
Fri Jan 21 11:45:01 2011 |
Aidan | Configuration | Locking | Ballpark figures for Green Locking PLLs (Digital vs Analogue) |
|
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|
4205
|
Wed Jan 26 10:11:47 2011 |
Aidan | Update | Green Locking | cavity scan |
|
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|
4209
|
Wed Jan 26 14:49:48 2011 |
Aidan | Update | Environment | Turned on Control room AC | 80 degrees is too uncomfortable in the
control room so I turned on the AC. The set
point is 74F. |
|
|
4217
|
Fri Jan 28 09:03:38 2011 |
Aidan | Summary | Green Locking | Digital Frequency Discriminator |
|
|
|
4227
|
Sun Jan 30 17:15:09 2011 |
Aidan | Summary | Green Locking | Digital Frequency discriminator - frequency noise | I've had a go at trying to estimate the
frequency noise of the digital frequency
discriminator (DFD). I input a 234.5Hz (0.5Vpp) |
|
|
4229
|
Mon Jan 31 07:03:59 2011 |
Aidan | Summary | Green Locking | DFD - noise spectra |
|
|
|
4230
|
Mon Jan 31 07:41:23 2011 |
Aidan | Update | Green Locking | DFD - medm screen | I added an MEDM screen for the DFD to the
GREEN screen. It is displayed in the attached
screen shot. |
|
|
4234
|
Mon Jan 31 18:25:25 2011 |
Aidan | Update | Green Locking | DFD - results from the new filters (and running with AWG) |
|
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