| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
11973
|
Wed Feb 3 23:23:47 2016 |
gautam | Update | Green Locking | Lightwave NPRO moved from PSL table to SP table | As Koji pointed out in the previous elog,
the CCD beam profiler was ill suited for
this measurement. Nevertheless, to get a |
|
|
11974
|
Thu Feb 4 09:16:46 2016 |
Koji | Update | Green Locking | Lightwave NPRO moved from PSL table to SP table | I don't think the discrepancy is a
serious issue as long as the mode is clean.
The mode is determined by the NPRO crystal |
|
|
11977
|
Fri Feb 5 00:23:01 2016 |
gautam | Update | Green Locking | Lightwave NPRO moved from PSL table to SP table | I've repeated the measurement for the
x-direction and also did the y-direction,
taking into account Koji's suggestion |
|
|
11978
|
Fri Feb 5 15:02:13 2016 |
gautam | Update | Green Locking | X-end NE cable | [Steve, gautam]
Steve thinks that the X-end Innolight
does not come with the noise-eater option |
|
|
11979
|
Fri Feb 5 16:50:24 2016 |
gautam | Update | Green Locking | First pass at mode-matching | I've done a first pass at trying to
arrive at a mode-matching solution for the
X-end table once we swtich the lasers out. |
|
|
11981
|
Mon Feb 8 15:36:37 2016 |
gautam | Update | Green Locking | Alternative mode-matching scheme | I looked in the optics cabinet to see what
lenses we have available, and re-ran the
mode-matching calculation to see if we could |
|
|
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 |
|
|
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 |
|
|
11987
|
Fri Feb 12 11:10:49 2016 |
Steve | Update | Green Locking | Innolight laser is 10 years old | It shipped out for repair evaluation.
Arrived to Hayward,CA 2016Feb16
|
|
|
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. |
|
|
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 |
|
|
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. |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
12564
|
Fri Oct 14 19:59:09 2016 |
Yinzi | Update | Green Locking | Continuing work with the TC 200 | Oct. 15, 2016
Another attempt (following elog
8755) |
|
|
12567
|
Tue Oct 18 17:11:42 2016 |
Yinzi | Update | Green Locking | More serial port troubleshooting | I connected to the serial port using |
|
|
12603
|
Mon Nov 7 17:24:12 2016 |
gautam | Update | Green Locking | Green beat setup on PSL table | I've been trying to understand the
green beat setup on the PSL table to see
if I can explain the abysmal mode-matching |
|
|
12609
|
Wed Nov 9 23:21:44 2016 |
gautam | Update | Green Locking | Green beat setup on PSL table | I tried to realize an improvement in the
mode matching onto the BBPDs by moving the
lens mentioned in the previous elog in this |
|
|
13099
|
Fri Jul 7 09:03:40 2017 |
Steve | Summary | History | as it was in 1994 |
|
|
|
10374
|
Wed Aug 13 10:50:04 2014 |
Andres | Update | IMC | Calculation for the input mode cleaner | Calculation for the input mode
cleaner
I have been working on the
calculation for the input mode cleaner. I |
|
|
10375
|
Wed Aug 13 13:08:24 2014 |
rana | Update | IMC | Calculation for the input mode cleaner | Can you please give us some more details
on how this design was decided upon? What
were the design considerations? |
|
|
10379
|
Wed Aug 13 22:01:57 2014 |
rana | Update | IMC | Calculation for the input mode cleaner | Nic,
Andres, and I discussed some more about the
MC WFS project today. We want |
|
|
10384
|
Thu Aug 14 15:10:47 2014 |
Andres | Update | IMC | Calculation for the input mode cleaner |
|
|
|
10410
|
Tue Aug 19 21:40:44 2014 |
Andres | Update | IMC | New Optical Setup for the IMC | IMC
Calculation and Setup
I have been working in the calculation |
11x |
|
10427
|
Fri Aug 22 18:05:02 2014 |
Andres | Update | IMC | Upgrade of the IMC WFSs for the reflection | Upgrade of IMC Reflection Optical
Setup
Nick and I upgrade the IMC.
We move both WFSs and placed them facing |
|
|
10428
|
Mon Aug 25 09:56:21 2014 |
Steve | Update | IMC | IMC WFSs upgrade |
The Napa earth quake magnitude
6 did not have any effect on the suspensions. |
|
|
10431
|
Tue Aug 26 23:46:55 2014 |
ericq | Update | IMC | WFS tuneup | I decided to see what I could do
with the new WFS setup.
First, I adjusted the WFS digital |
|
|
10432
|
Wed Aug 27 09:12:47 2014 |
Koji | Update | IMC | WFS tuneup | I'm sure that the 1~3Hz motion comes from
the mirror motion, but not 100% sure what
is causing |
|
|
11281
|
Mon May 11 13:26:02 2015 |
manasa | Update | IMC | MC_F calibration | The last MC_F calibration was done by Ayaka
: Elog
7823 |
|
|
11284
|
Mon May 11 18:14:52 2015 |
rana | Update | IMC | MC_F calibration | I saw that entry, but it doesn't state
what the calibration is in units of Hz/counts.
It just gives the final calibrated spectrum. |
|
|
12623
|
Thu Nov 17 15:17:16 2016 |
gautam | Update | IMC | MCL Feedback | As a starting point, I was looking at some
of the old elogs and tried turning on the
MCL feedback path with the existing control |
|
|
12635
|
Wed Nov 23 01:13:02 2016 |
gautam | Update | IMC | MCL Feedback | I wanted to get a clearer idea of the FSS
servo and the various boxes in the signal
chain and so Lydia and I poked around the |
|
|
12637
|
Wed Nov 23 15:08:56 2016 |
rana | Update | IMC | MCL Feedback | In the Generic
Pentek interface board, which is used
to take in the analog 2-pin LEMO cable |
|
|
12655
|
Thu Dec 1 20:20:15 2016 |
gautam | Update | IMC | IMC loss measurement plan | We want to measure the IMC round-trip loss
using the Isogai
et. al. ringdown technique. I spent some |
|
|
12660
|
Fri Dec 2 16:40:29 2016 |
gautam | Update | IMC | 24V fuse pulled out | I've pulled out the 24V fuse block
which supplies power to the AOM RF driver.
The way things are set up on the PSL table, |
|
|
12663
|
Mon Dec 5 01:58:16 2016 |
gautam | Update | IMC | IMC ringdowns | Over the weekend, I worked a bit on getting
these ringdowns going. I will post a more
detailed elog tomorrow but here is a quick |
|
|
12665
|
Mon Dec 5 15:55:25 2016 |
gautam | Update | IMC | IMC ringdowns | As promised, here is the more detailed
elog.
Part |
7x |
|
12666
|
Mon Dec 5 19:29:52 2016 |
gautam | Update | IMC | IMC ringdowns | The MC1 suspension troubles vanished as
they came - but the IMC was remaining locked
stably so I decided to do another round of |
|
|
12667
|
Tue Dec 6 00:43:41 2016 |
gautam | Update | IMC | more IMC ringdowns | In an effor to see if I could narrow down
the cause of the 100kHz ringing seen in the
reflected PD signal, I tried a few things. |
|