| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
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 |
|
|
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 |
|
|
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 |
|
|
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. |
|
|
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 |
|
|
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 |
|
|
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. |
|
|
12026
|
Mon Mar 7 23:51:36 2016 |
gautam | Update | Green Locking | Laser swap - some improvement |
|
|
|
12027
|
Tue Mar 8 18:22:20 2016 |
rana | Update | Green Locking | Laser swap - some improvement | Why is the transmission of X green so low?
Perhaps you can phase lock the IR and then
scan the X frequency, using the X arm as |
|
|
12016
|
Wed Mar 2 17:42:19 2016 |
gautam | Update | Green Locking | Laser swap - some progress | [Koji, Johannes, gautam]
With Koji's and Johannes'
help, I managed to resolve the coupling the |
|
|
12023
|
Sat Mar 5 23:31:01 2016 |
gautam | Update | Green Locking | Laser swap - some updates | I've been a little behind on my elogs
so here is an update of the end laser situation.
IR beat for X-end recovered |
|
|
12013
|
Mon Feb 29 17:17:26 2016 |
gautam | Update | Green Locking | Laser swap - still no green beatnote | I continued the hunt for a green beatnote
today - I decided to take the output from
the RF amplifiers sitting on the PSL table |
|
|
11984
|
Tue Feb 9 19:15:36 2016 |
gautam | Update | Green Locking | Laser swap - updates | Some updates on the laser swap situation:
Mode-matching calculation:
I
should have caught this earlier, but it was |
|
|
11985
|
Wed Feb 10 17:57:15 2016 |
gautam | Update | Green Locking | Laser swap - updates | After the discussion at the meeting, I
decided to go ahead and open the top of the
oven so that I could get a visual on where |
|
|
12002
|
Mon Feb 22 13:56:52 2016 |
gautam | Update | Green Locking | Laser swap -reflected beam from ETM aligned | I tried aligning the green beam, elliptical
as it is, to the arm by using the various
steering mirrors after the doubling oven. |
|
|
11982
|
Tue Feb 9 04:37:10 2016 |
ericq | Update | Green Locking | Laser swap initiated | [ericq, Gautam]
Tonight we embarked on the laser
swap. In short, we have gotten ~210mW through |
|
|
11983
|
Tue Feb 9 11:49:47 2016 |
gautam | Update | Green Locking | Laser swap initiated | Steve pointed me to an old
elog by Zach where he had measured the
waist of the 1W Innolight NPRO. I ran |
|
|
6429
|
Tue Mar 20 09:59:01 2012 |
steve | Update | IOO | Laser tripped off | Today is janitor day. It still does not
explain why the 2W Innolight tripped off
about an hour ago. All back to normal. |
|
|
10508
|
Tue Sep 16 10:47:52 2014 |
Steve | Update | PSL | Laser turned on | Our janitor turned off the laser
accidentally. |
|
|
10509
|
Tue Sep 16 14:26:45 2014 |
ericq | Update | PSL | Laser turned on |
|
|
|
10510
|
Tue Sep 16 16:03:36 2014 |
Koji | Update | PSL | Laser turned on |
|
|
|
8023
|
Thu Feb 7 14:10:25 2013 |
Manasa | Update | Optics | LaserOptik - AR Reflectivity - Bad data | Reflectivity of AR surface of LaserOptik
(SN6)
|
|
|
6907
|
Tue Jul 3 17:56:35 2012 |
Jamie | Update | Green Locking | Laseroptik dichroic optics received | We have received the dichroic optics from
Laseroptik. The coatings are:
HR: |
|
|
6909
|
Tue Jul 3 19:04:59 2012 |
Jamie | Update | Green Locking | Laseroptik dichroic optics received | I put them in the "visible optics"
drawer of the newish, metal optics cabinet
with the thin drawers down the Y arm. |
|
|
7930
|
Wed Jan 23 18:16:11 2013 |
Manasa | Update | General | Laseroptik mirror - SN6 | I repeated the transmittance measurements
of LaserOptik SN6 @1064nm.
Transmittance for s-polarization |
|
|
7932
|
Wed Jan 23 20:24:05 2013 |
Koji | Update | General | Laseroptik mirror - SN6 | Got confused (even after I talked with
Manasa).
The plot shows the number ~0.01 or |
|
|
7935
|
Wed Jan 23 22:02:25 2013 |
Manasa | Update | General | Laseroptik mirror - SN6 |
|
|
|
7940
|
Thu Jan 24 15:16:50 2013 |
Manasa | Update | General | Laseroptik mirror - SN6 | I repeated the transmittance measurements
of Laseroptik SN6 at 1064nm. The rotation
stage could only resolve 2 deg rotation (We |
|
|
7941
|
Thu Jan 24 16:23:24 2013 |
Koji | Update | General | Laseroptik mirror - SN6 | The mirror T is completely out of spec.
We should find or request the data sheet
of the mirror. |
|
|
7943
|
Thu Jan 24 16:34:56 2013 |
rana | Update | General | Laseroptik mirror - SN6 | I have two questions:
1) Are we sure that the T measurement
is not being compromised by some systematic? |
|
|
7944
|
Fri Jan 25 08:10:42 2013 |
Steve | Update | General | Laseroptik mirrors | Here are the German plots. Unfortunately
they are not logarithmic.
Ed: Proprietary data removed. |
|
|
14400
|
Tue Jan 15 15:27:36 2019 |
gautam | Update | General | Lasers and other stuff turned back on | VEA is now a laser hazard area
as usual, several 1064nm lasers
in the lab have been turned back on. Apart |
|
|
7192
|
Wed Aug 15 13:23:34 2012 |
Liz | Summary | Computer Scripts / Programs | Last Weekly Update | Over the past week I have been continuing
to finalize |
|
|
11584
|
Wed Sep 9 11:00:49 2015 |
Ignacio | Update | IOO | Last Wiener MCL subtractions | On Thursday
night (sorry for the late elog) I decided
to give the MCL FF one more try. |
11x |
|
11592
|
Sun Sep 13 13:26:00 2015 |
rana | Update | IOO | Last Wiener MCL subtractions | When making the Wiener filter OFF/ON comparisons,
we want to use the median PSD estimates,
not the mean (which is what pwelch gives |
|
|
11713
|
Mon Oct 26 18:10:38 2015 |
Ignacio | Update | IOO | Last Wiener MCL subtractions | As per Eric's request, here is the
code and TF measurement that was used to
calculate the MC2 FF filter that is loaded |
|
|
3620
|
Wed Sep 29 12:08:28 2010 |
josephb, alex | Summary | CDS | Last burt save of old controls | This is being recorded for posterity so
we know where to look for the old controls
settings. |
|
|
7399
|
Mon Sep 17 20:23:31 2012 |
Jenne | Update | General | Last of In-vac mirror photos taken | [Manasa, Jenne]
We took the last of the in-vac photos
of mirrors today. I'll post in the |
|
|
7400
|
Mon Sep 17 23:58:01 2012 |
rana | Update | General | Last of In-vac mirror photos taken | My hope is that the DRMI flashes
will be bright enough to see on the PO beams.
IF we get 10 mW through the Faraday, you |
|
|
7401
|
Tue Sep 18 11:53:12 2012 |
Jenne | Update | General | Last of In-vac mirror photos taken |
|
|
|
7406
|
Wed Sep 19 01:15:15 2012 |
Jenne | Update | General | Last of In-vac mirror photos taken - NOT! | I'm making a separate entry to go along
with this thread of photos...
Putting the camera and 'bathroom' |
|
|
14893
|
Tue Sep 17 23:46:21 2019 |
Koji | Update | CDS | Latch Enable Logic | [Koji Gautam]
We continued to check the latch
logic. Today we found that latch.py didn't |
|
|
3235
|
Fri Jul 16 13:05:48 2010 |
Kyung-ha | Update | SUS | Late update for 7/13 Tue (Tip Tilts) | [Jenne & Kyung-ha]
We suspended the mirror to one of
the main frame with the ECD backplane we |
|
|
4893
|
Tue Jun 28 02:11:47 2011 |
Jenne | Update | Locking | Latest MICH noise budget | I have measured / calculated the latest
MICH noise budget. It doesn't really
look all that stellar. |
|
|
5035
|
Tue Jul 26 03:15:52 2011 |
Jenne | Update | Locking | Latest MICH noise budget | [Jenne, Rana]
We had another look at the MICH noise
budget tonight. Rana has verified that my |
|
|
10014
|
Mon Jun 9 20:07:53 2014 |
nicolas | HowTo | Computer Scripts / Programs | Latex (math) in the elog |
|
|
|
3027
|
Tue Jun 1 18:39:59 2010 |
Nancy | Update | | Lead spheres for the seismographs |
the lead spheres that were placed
below the granite slab have been flattened |
|
|
16717
|
Wed Mar 9 10:23:28 2022 |
Jordan | Update | VAC | Leak Testing of New Manual Gate Valve - Attempt #1 | Jordan, Chub, Paco
Chub and I went into the lab this
morning to leak check the new gate valve |
|
|
16721
|
Thu Mar 10 09:39:59 2022 |
Jordan | Update | VAC | Leak Testing of New Manual Gate Valve - Attempt #2 | This morning Chub and I leak checked the
manual gate valve with the RGA and helium.
There was no change in the helium partial |
|