| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
17
|
Sun May 22 23:40:45 2016 |
Gabriele | Optics | Design | Optical levers layout | An improved design is attached. I modified
the input telescope to avoid using shor focal
length lenses, to make it less critical, |
|
|
23
|
Thu Jun 16 00:47:42 2016 |
Gabriele | Optics | Daily Progress | Quality factor measurement of a Mark Optics disk at LMA | [Massimo Granata (LMA), Quentin Cassar
(LMA), Gabriele]
This week I'm visiting LMA |
|
|
51
|
Mon Jul 18 18:05:46 2016 |
Gabriele | Optics | Daily Progress | Optical setup | Small modifications to the optical setup:
added a 1m focal lenght
lens (AR coated for 1064nm...) right before |
|
|
60
|
Mon Jul 25 15:35:31 2016 |
Gabriele | Optics | Characterization | Calibration of the QPD in physical units | The
equations below are wrong. Please refer to https://nodus.ligo.caltech.edu:8081/CRIME_Lab/116 |
|
|
91
|
Fri Aug 19 19:05:01 2016 |
Gabriele | Optics | Daily Progress | Disk installed into the chamber | I assembled the disk suspension sytem and
installed into the chamber. Although I don't
have the magnets and coils, I installed the |
10x |
|
95
|
Sun Aug 21 13:45:56 2016 |
Gabriele | Optics | Daily Progress | Wierd behavior of ring downs and Improved setup | The last two ring downs I measured today
showed a weird behavior of the lowest modes:
|
|
|
101
|
Mon Aug 22 16:59:13 2016 |
Gabriele, Alastair | Optics | Daily Progress | Laser polishing of the disk edges | We set up a test facility for laser polishing
the disk edges, using the CO2 laser in the
TCS laboratory. We focused the beam with |
|
|
105
|
Thu Sep 1 02:13:33 2016 |
Gabriele | Optics | Characterization | Expected frequencies for the 75 mm disks with flats | Here are the nominal parameters of the
disk with flats
|
|
|
116
|
Tue Sep 20 15:34:00 2016 |
Gabriele | Optics | Daily Progress | Improved optical lever layout | Goal
Improve the optical setup,
by increasing the response of the QPD to
disk motion. |
|
|
122
|
Thu Sep 22 13:39:40 2016 |
Gabriele | Optics | Configuration | Updated design for the new C.Ri.Me. setup | Today I measured the amount of space available
on the table for the new (4-fold) C.Ri.Me.
setup. It's 1050 x 1220 mm, with the |
|
|
127
|
Mon Sep 26 15:59:09 2016 |
Gabriele | Optics | Daily Progress | QPD auto centering | We have a few motorized mounts (with New
Focus picomotors) and one controller (an
old New Focus 8753, six axis total) that |
|
|
132
|
Thu Sep 29 15:40:45 2016 |
Gabriele | Optics | Design | Beam profile of new 21mW HeNe laser and tweak of optical lever design | I measured the beam profile of the new
Thorlabs HeNe (21.8 mW measured). The beam
waist is 355 microns, very close to the laser |
|
|
270
|
Fri Jan 20 17:20:20 2017 |
Gabriele | Optics | Daily Progress | Input part of the optical lever setup installed and aligned | Today I installed and aligned part of the
optical components for the optical lever
of the new setup. For the moment being I |
|
|
272
|
Mon Jan 23 16:29:52 2017 |
Gabriele | Optics | Daily Progress | Input part of the optical lever setup installed and aligned | Today I cabled and installed the four QPD,
in a temporary position. I also assembled
four picomotor mounts that will be used for |
|
|
280
|
Fri Jan 27 14:56:55 2017 |
Gabriele | Optics | Daily Progress | Optical lever setup completed | The four optical levers are completely
installed and aligned to a horizontal reference.
|
|
|
287
|
Wed Feb 1 15:23:42 2017 |
Gabriele | Optics | Noise hunting | Wandering line is due to the laser | The wandering line I mentioned in my previous
elog, which is spoiling most of the sensitivity,
turns out to be power noise of the laser. |
|
|
291
|
Mon Feb 6 11:19:13 2017 |
Gabriele | Optics | Daily Progress | Laser swap | The Thorlabs laser has been misbehaving
for the whole weekend. Even after many days
being continuosly on, the wandering line |
|
|
295
|
Tue Feb 7 16:16:37 2017 |
Gabriele | Optics | Daily Progress | Lasers | The high power lasers I tested so far (the
Thorlabs 21mW and the JDSU 1125P) are noisy:
they both have wandering lines that from |
|
|
296
|
Wed Feb 8 17:01:01 2017 |
Gabriele | Optics | Daily Progress | Two laser installed, setup aligned | Today I swapped out the 8mW laser
and installed two 2.5 mW lasers. I rebuilt
the input part of the optical levers and |
|
|
300
|
Thu Feb 9 09:30:52 2017 |
Gabriele | Optics | Daily Progress | Two laser installed, setup aligned | The lasers are behaving well, there is
no high noise or wandering lines. The spectrum
below is taken in air: that explains the |
|
|
301
|
Thu Feb 9 11:35:27 2017 |
Gabriele | Optics | Configuration | QPD calibration | This morning I measured the beam profiles
at the QPD positions. As expected, the beams
are not gaussian there, since we are seeing |
11x |
|
311
|
Fri Feb 17 13:44:47 2017 |
Gabriele | Optics | Daily Progress | Swapped picomotor and re-alignment | Since I had recurrent problems with the
picomotors used for QPD3, I swapped them
with another Newport motorized mirror that |
|
|
331
|
Fri Mar 10 16:44:13 2017 |
Gabriele | Optics | Daily Progress | Updated in vacuum periscope of CR0 | This afternoon I removed the old periscope
from CR0 and installed a new one with finely
adjustable mount, like those in the new chamber. |
|
|
336
|
Thu Mar 30 15:23:44 2017 |
Gabriele | Optics | General | Swapped HeNe laser in CR0 | The JDSU HeNe laser 1103P that I was using
is dead. I swapped it with a JDSU 1125P borrowed
from the 40m. |
|
|
338
|
Fri Apr 7 16:19:03 2017 |
Gabriele | Optics | Daily Progress | New 1103P laser installed | This afternoon I installed the new Lumentum
(former JDSU) HeNe laser, model 1103P in
CR0. |
|
|
454
|
Tue Jan 30 09:19:09 2018 |
Gabriele | Optics | Configuration | Setup for 50mm disks | I realigned all optical levers to measure
the 50mm disks. In brief, I moved the input
2" mirrors, the in-vacuum 2" mirrors |
|
|
459
|
Tue Feb 13 16:28:49 2018 |
Gabriele | Optics | Configuration | Setup resigned for 75mm disks | |
|
|
479
|
Thu Mar 8 09:40:10 2018 |
Gabriele | Optics | Configuration | Realigned all optical levers to horizontal reference | |
|
|
497
|
Tue Mar 27 16:36:49 2018 |
Gabriele | Optics | Configuration | Optical levers re-aligned for 50mm substrates | |
|
|
658
|
Fri Apr 12 09:36:54 2019 |
Gabriele | Optics | Configuration | Realignment | I realigned the entire CR1-4 setup
ensured that beam out of
the chamber are at 6" height everywhere. |
|