| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
11988
|
Fri Feb 12 17:05:40 2016 |
gautam | Update | Green Locking | Laser swap - green light recovered but no flashes in the arm | After carefully tweaking the mode-matching
of the IR into the crystal and the four-axis
translation stage on which the doubling oven |
|
|
11989
|
Fri Feb 12 19:07:52 2016 |
Koji | Update | Green Locking | Laser swap - green light recovered but no flashes in the arm | 800e-6 / 0.225^2 = 0.016
=> 1.6%/W
I thought Kiwamu had roughtly 2%/W. |
|
|
12019
|
Fri Mar 4 01:11:41 2016 |
gautam | Update | Green Locking | Laser swap - both green beatnotes found | The good news: both green beatnotes have
now been found. The problem was alignment
on the green beat PD on the PSL table which |
|
|
11999
|
Fri Feb 19 00:42:19 2016 |
gautam | Update | Green Locking | Laser swap - beam ellipticity from laser? | Eric and I spent some time yesterday night
trying to recover the green in the arm after
the laser swap. The problem essentially was |
|
|
12006
|
Tue Feb 23 23:01:16 2016 |
gautam | Update | Green Locking | Laser swap - Green PDH locking | Given that we were seeing green flashes
in the arms, I tried to see if I could get
the green locked to the arm in a nice mode. |
|
|
12009
|
Wed Feb 24 19:29:13 2016 |
gautam | Update | Green Locking | Laser swap - Green PDH locked | After the discussion at the meeting today,
I decided to try and lock the green by sweeping
through PZT dither frequencies in the vicinity |
|
|
12012
|
Fri Feb 26 01:52:44 2016 |
gautam | Update | Green Locking | Laser swap - Green PDH OLTF | I spent some more time today trying to
optimize the modulation frequency and amplitude
for the X end PDH, and the alignment/mode-matching |
|
|
12017
|
Thu Mar 3 01:25:50 2016 |
gautam | Update | Green Locking | Laser swap - 2 IR + 1 green beatnotes found | [ericq, gautam]
Summary of work done tonight:
The PDH setup at the Y-end |
|
|
12083
|
Tue Apr 19 18:37:29 2016 |
gautam | Update | endtable upgrade | Laser swap + optical layout | Summary of work done over the last
two days
Lightwave NPRO |
|
|
1034
|
Wed Oct 8 19:17:55 2008 |
Yoichi | Configuration | PSL | Laser power is slowly recovering | This afternoon we (rich, steve, yoichi) shutdown
the laser for the DC-DC converter installation.
|
|
|
10102
|
Wed Jun 25 17:13:10 2014 |
Nichin | Update | Electronics | Laser power check - PDFR system | [Nichin, Manasa]
I wanted to make sure Alex's system
of Diode laser + laser controller + optical |
|
|
9255
|
Mon Oct 21 09:46:12 2013 |
Steve | Update | PSL | Laser just turned on | I have just turned on the PSL Innolight
laser. The laser shut down with unknown
reason a day ago. |
|
|
12035
|
Tue Mar 15 10:31:58 2016 |
Steve | Update | IOO | Laser is turned back on | It's may be the janitor's doing.
I noticed that the HEPA filers
were off. They are turned on at 20% |
|
|
12041
|
Tue Mar 22 14:12:18 2016 |
Steve | Update | IOO | Laser is turned back on | The 2W Innolight was turned on.
|
|
|
1256
|
Wed Jan 28 19:08:50 2009 |
Yoichi | Update | PSL | Laser is back (sort of) | Yoichi, Peter, Jenne
Summary:
|
|
|
1257
|
Thu Jan 29 13:52:34 2009 |
Yoichi | Update | PSL | Laser is back (sort of) | Here is what I think has happened to the laser.
After the chiller line to the NPRO base clogged, |
|
|
14978
|
Fri Oct 18 18:13:55 2019 |
Koji | Update | safety | Laser interlock looks OK | I've checked the state of the laser
interlock switch and everything looked normal. |
|
|
13353
|
Tue Oct 3 01:32:39 2017 |
gautam | Update | LSC | Laser intensity noise coupling to MICH (simulated) | GV Oct 6: This
coupling is probably not correct - Finesse |
|
|
13414
|
Wed Nov 8 00:28:16 2017 |
gautam | Update | LSC | Laser intensity coupling measurement attempt | I tried measuring the coupling of PSL intensity
noise by driving some broadband noise bandpassed
between 80-300Hz using the spare DAC channel |
|
|
1568
|
Sat May 9 00:15:21 2009 |
Yoichi | Update | PSL | Laser head temperature oscillation | After the laser cooling pipe was unclogged,
the laser head temperature has been oscillating
in 24h period.
|
|
|
1569
|
Sat May 9 02:20:11 2009 |
Jenne | Update | PSL | Laser head temperature oscillation | [quote]After the laser cooling pipe was unclogged,
the laser head temperature has been oscillating
in 24h period.
|
|
|
1570
|
Sat May 9 15:19:10 2009 |
rana | Update | PSL | Laser head temperature oscillation | This is 8 days of 10-minute trend.
DTEC is just the feedback control signal |
|
|
3417
|
Thu Aug 12 23:49:04 2010 |
nancy | Update | Environment | Laser chiller temp raised | Since the laser is off, Jenne and I rasied
the chiller-chiller (small AC in the Control
Room) set point temperature to |
|
|
1003
|
Mon Sep 29 01:19:40 2008 |
rana | Summary | PSL | Laser chiller running a little hot | I looked at it some last night and my suspicion
was the ISS. Whenever the ISS switch came
on the FAST got a kick.
|
|
|
1005
|
Mon Sep 29 13:23:40 2008 |
rob | Summary | PSL | Laser chiller running a little hot | [quote]I looked at it some last night and
my suspicion was the ISS. Whenever the ISS
switch came on the FAST got a kick.
|
|
|
16024
|
Tue Apr 13 20:45:16 2021 |
Yehonathan | Update | PSL | Laser amplifier | {Yehonathan, Rana}
We unpacked the content of the
amplifier crate in front of the water fountain |
|
|
16032
|
Wed Apr 14 19:48:18 2021 |
gautam | Update | PSL | Laser amplifier | A couple of years ago, I got some info
about the amplifier setup at the sites from
Terra - sharing here in case there is some |
|
|
16034
|
Thu Apr 15 09:46:24 2021 |
Yehonathan | Update | PSL | Laser amplifier | Some more relevant documents provided by
Matt:
Phase |
|
|
16044
|
Fri Apr 16 18:21:36 2021 |
Yehonathan | Update | PSL | Laser amplifier | I surveyed a bit the 1X1/2 area to plan
for the installation of the laser amplifier.
There is a vacancy at the bottom |
|
|
16046
|
Sun Apr 18 21:29:55 2021 |
rana | Update | PSL | Laser amplifier |
Ideally, we put the chiller outside
of the interferometer area. The PSL chiller
used to be in the control room near the door |
|
|
16062
|
Wed Apr 21 11:09:57 2021 |
yehonathan | Update | PSL | Laser amplifier | I went to the TCS lab to take a look at
the chillers lying around. I spotted two
chillers: |
|
|
16080
|
Thu Apr 22 17:28:34 2021 |
Yehonathan | Update | PSL | Laser amplifier | According to the aLIGO
70W amplifier interlock concept the flow
rate of the chiller should be between 5 and |
|
|
552
|
Mon Jun 23 15:22:04 2008 |
rana | Bureaucracy | SAFETY | Laser Safety Walkthrough today | |
|
|
1639
|
Mon Jun 1 15:01:31 2009 |
rana | Update | PSL | Laser Power after fixing the laser chiller: more traces | If you look at the correlation between RMTEMP
and HTEMP, you see what we knew: namely that
there
|
|
|
1636
|
Mon Jun 1 13:56:52 2009 |
Alberto | Update | PSL | Laser Power after fixing the laser chiller | The laser power seems to have become more
stable after fixing the laser chiller. The
power is lower than it used to be (MOPA amplitude |
|
|
1466
|
Thu Apr 9 23:20:35 2009 |
rob | Summary | Locking | Laser PM to REFL-DC transfer functions at multiple CARM offsets |
|
|
|
1468
|
Fri Apr 10 03:10:08 2009 |
rana | Summary | Locking | Laser PM to REFL-DC transfer functions at multiple CARM offsets | I hereby award the previous rainbow transfer
functions the plot innovation of the month
award for its use of optical frequency to |
|
|
1465
|
Thu Apr 9 23:11:27 2009 |
rob | Summary | Locking | Laser PM to PO-DC transfer functions at multiple CARM offsets | I've plotted some transfer functions showing
the response at POB DC to laser frequency
(phase) noise. There are transfer functions |
|
|
6500
|
Fri Apr 6 19:40:57 2012 |
Mike J. | Summary | General | Laser Emergency Shutoff | I accidently shut off the laser at 19:34
with the emergency shutoff button while trying
to tap into a video line for the Sensoray |
|
|
6501
|
Fri Apr 6 20:05:12 2012 |
Jamie | Summary | General | Laser Emergency Shutoff | We reset the interlock and restarted the
PSL. The end AUX lasers seem to have
come back online fine. PMC and mode |
|
|
3588
|
Mon Sep 20 10:33:21 2010 |
josephb | Bureaucracy | Computers | Larry stopped by - GC machine had conflicting IP | Larry stopped by today and had to disconnect
the m25 machine (this is the 1st GC machine
on the left as you walk into the control |
|
|
4338
|
Tue Feb 22 14:37:24 2011 |
steve | Update | SAFETY | Larisa received 40m safety training | Larisa Thorne received 40m lab specific,
basic safety training. She will attend P.
King's Basic Laser Safety Training Session |
|
|
17483
|
Fri Feb 24 15:21:39 2023 |
JC | Update | General | Large Optical Table Movement Solidworks | I sketched up the first encounter we will
have when moving the optical table out. I'm
assuming the table has already been turned |
|
|
14548
|
Wed Apr 17 00:50:17 2019 |
gautam | Update | ALS | Large 2kHz peak (and harmonics) in ALS X no more | I looked into this issue today. Initially,
my thinking was that I'd somehow caused
clipping in the beampath somewhere which |
|
|
14549
|
Wed Apr 17 11:01:49 2019 |
gautam | Update | ALS | Large 2kHz peak (and harmonics) in ALS X no more | EX green stayed locked to XARM length overnight
without a problem. The spectrogram doesn't
show any alarming time varying features around |
|
|
14533
|
Thu Apr 11 01:10:05 2019 |
gautam | Update | ALS | Large 2kHz peak (and harmonics) in ALS X | These weren't present last week. The
peaks are present in the EX PDH error monitor
signal, and so are presumably connected with |
|
|
1231
|
Fri Jan 16 11:28:54 2009 |
Yoichi | Update | Computers | Lab. laptop needs wireless lan driver update | One of the lab. laptops (belladonna) cannot
connect to the network now.
I guess this was caused by someone clicked |
|
|
17680
|
Thu Jul 13 12:15:12 2023 |
JC | Update | General | Lab walkthrough | [Koji, JC]
Koji and I had a walkthrough of
the Y Arm and raised questions of what accommodations |
|
|
15603
|
Tue Sep 29 17:07:25 2020 |
gautam | Update | General | Lab visit for inventory location | I was in the lab from 1630-1830. I have located
and visually inspected all the parts required
for the magnet regluing / optic cleaning |
|
|
14545
|
Mon Apr 15 22:55:34 2019 |
gautam | Frogs | Thermal Compensation | Lab thermostat adjusted | It is feeling cold in the office area.
According to the digital wall clock near
the coffee machine, it is 19C. Rana bumped |
|