| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
1467
|
Tue Aug 5 14:54:36 2014 |
Evan | DailyProgress | optic | BRDF of AlGaAs mirror 132 after cleaning |
|
|
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1468
|
Tue Aug 5 18:10:31 2014 |
Evan | DailyProgress | optic | AlGaAs mirror transmissions; optical contacting | I used the ThorLabs power meter to get
the transmission coefficients for the five
AlGaAs mirrors. |
|
|
1471
|
Thu Aug 14 15:23:36 2014 |
Emily, Evan | Notes | optic | AOM fiber noise cancellation | New
setup for fiber phase noise cancellation |
|
|
1472
|
Thu Aug 14 15:24:14 2014 |
Emily | Notes | optic | Temporarily changed angle on half wave plate | (Laser going to ACAV) I changed the angle
of the half-waveplate before the PBS in order
to increase the amount of power going into |
|
|
1486
|
Wed Aug 27 03:21:53 2014 |
rana | Summary | optic | optimization for ETM with a-Si/SiO2 coatings | I filled in more values for a-Si
at 120 K into the wiki
that Matt Abernathy set up. Then I ran |
|
|
1488
|
Thu Aug 28 17:36:03 2014 |
Evan | DailyProgress | optic | Mode-matching solution for north cavity | Current configuration:
Target waist: 180 µm,
z = 0 mm
Lens 1: 140 |
|
|
1489
|
Thu Aug 28 19:10:40 2014 |
Evan | DailyProgress | optic | Mode-matching solution for north cavity |
|
|
|
1503
|
Sat Sep 6 12:54:05 2014 |
Tara, Evan | DailyProgress | optic | North photothermal TF | Tara and I took an SR785 measurement of
the north photothermal transfer function.
Clearly there's something wrong with |
|
|
1505
|
Sun Sep 7 19:33:40 2014 |
Tara, Evan | DailyProgress | optic | North photothermal TF | Tara and I took another photothermal TF
of the north cavity today. Relevant parameters:
Power incident on cavity: |
|
|
1506
|
Sun Sep 7 20:37:50 2014 |
Tara, Evan | DailyProgress | optic | Some lens tweaks | Some minor maintenance/improvements to
the optical setup:
We replaced the existing |
|
|
1511
|
Thu Sep 11 00:47:14 2014 |
Evan | DailyProgress | optic | South photothermal TF | I took a swept-sine measurement of the
photothermal TF just as Tara and I did for
the north cavity. To get a better measurement, |
|
|
1512
|
Thu Sep 11 11:40:41 2014 |
Evan | DailyProgress | optic | South photothermal TF |
|
|
|
1532
|
Sun Nov 16 23:32:49 2014 |
Evan | DailyProgress | optic | North photothermal TF | I believe the factor of π / F
here is an error. It should instead be the
transmission T. That lowers the absorption |
|
|
1550
|
Sat Jun 20 10:14:50 2015 |
Evan | Notes | optic | coating optimization for AlGaAs:electric field in coating layer | I reran multidiel_rt with the as-built
coating structure. The penetration depth
is x0 = |
|
|
1551
|
Sat Jun 20 22:59:58 2015 |
Evan | DailyProgress | optic | South Faraday isolator path reworked | I reworked the beginning of the south optical
path so that there are two steering mirrors
before the beam goes into the FI. |
|
|
1552
|
Tue Jun 23 20:37:22 2015 |
Evan | DailyProgress | optic | Pointing recovered | Pointing into both cavities has been recovered.
I could not get the PMC on the
south path to lock, so I have just taken |
|
|
1553
|
Wed Jun 24 16:19:37 2015 |
Evan | DailyProgress | optic | Locking recovered | I reinstalled the old, underpowered unipolar
HV supply that we used to use for the south
cavity. Since Aidan is going to redo the |
|
|
1594
|
Tue Oct 20 19:43:05 2015 |
Antonio/Aidan/Eric | DailyProgress | optic | Optics inventory | The work that we need to do for the TCN
experiment is at the state where we cannot
easily go further without improving |
|
|
1649
|
Sat Jun 25 18:12:56 2016 |
Antonio | DailyProgress | optic | North path construction progress | North Path
SUMMARY
The north path is going |
|
|
1651
|
Sun Jun 26 21:08:17 2016 |
Antonio | DailyProgress | optic | North path construction progress: PMC MM lenses | Summary
I have added two lenses in order
to create a waist of 330um for when the PMC |
|
|
1663
|
Fri Jul 8 22:09:33 2016 |
Antonio | DailyProgress | optic | North path construction progress 2 | North Path
Summary
Following entry ID 1649, additional |
|
|
1670
|
Thu Jul 14 20:57:07 2016 |
Antonio | DailyProgress | optic | South path construction progress | Summary
Following ID 1649 we start the implementation
of the South cavity path. |
|
|
1799
|
Tue Jan 3 23:09:34 2017 |
awade | DailyProgress | optic | Moved FSS EOM backward 6 cm | I was unable to remove a ~32 kHz ringing
from the north path lock. I thought possibly
that it might have to do with polarisation |
|
|
1974
|
Wed Nov 8 20:31:24 2017 |
awade, Craig | DailyProgress | optic | Reducing residual 14.75 MHz AM and some changes to the north path | [awade, Craig]
Yesterday we went hunting for residual
AM from the PM phase modulators. This |
|
|
2252
|
Mon Nov 12 11:53:50 2018 |
anchal | Notes | optic | Changed half waveplate angle after South EAOM | For some reason after the weekend, I found
that the laser power on the south path decreased
by about 300 uW. On checking power with a |
|
|
1994
|
Thu Nov 30 12:02:05 2017 |
awade, Craig | DailyProgress | scatter | Initial buzz test and cleaning of periscope mirrors and final MM lens | --- This is a backpost
from last week --- |
|
|
2022
|
Tue Dec 19 22:44:48 2017 |
awade | DailyProgress | scatter | Buzz test of beat board | I used the buzzer to help locate sources
of scatter in the transmission beat board.
Here I used the SR785 in swept |
|
|
2023
|
Thu Dec 21 08:58:39 2017 |
Craig | DailyProgress | scatter | Scatter Shoulder Fit | I've been learning about scattering
from here
and here. |
|
|
2026
|
Thu Dec 21 18:57:12 2017 |
awade | DailyProgress | scatter | Switch out final MM lens in North path | As pictured in PSL:1994,
there was a burn mark in the center of the
final lens before the north reference cavity. |
|
|
2028
|
Fri Dec 22 14:38:24 2017 |
awade | DailyProgress | scatter | Fixed bad PDH error signal | It turns out that the bad PDH signal
caused by monitor daughter board (D040424)
note being properly seated in its plug. |
|
|
2033
|
Sun Jan 7 17:53:26 2018 |
Craig, awade | DailyProgress | scatter | Scattering Sources Probably From Inside Vaccan | TL;DR We have (1)
poor alignment of light into the cavities
and (2) ghost |
|
|
2036
|
Mon Jan 8 14:46:09 2018 |
Craig | DailyProgress | scatter | North Cavity Transmission Backreflection | Yesterday I optimized the North cavity
visibility for a long time, and achieved
around 60% visibility, which is pretty good |
|
|
2064
|
Mon Jan 29 20:22:06 2018 |
Craig | DailyProgress | scatter | Pre-Vent Vaccan Tranmission Scattering Drawing | I drew the basic scatterers I see when
viewing the inside of our vaccan from the
transmission port with the IR viewer. |
|
|
2084
|
Fri Feb 9 18:36:40 2018 |
awade, Craig | DailyProgress | scatter | Scatter dumping around FSS reflection PDs | I
reinstalled the green glass dump in the north
cavity FSS REFL PD prompt reflection path. |
|
|
2093
|
Thu Feb 15 18:45:35 2018 |
Craig | DailyProgress | scatter | Need more Black Glass Hexagonal Bases | Made nine black glass hex beam dumps today.
Only stopped because we ran out of hex bases.
Need to order more. |
|
|
2127
|
Fri Mar 9 16:10:41 2018 |
Craig, awade | DailyProgress | scatter | 500 Hz resonant scatter hump in beatnote ASD | If you look at our
beatnote ASD you can see a broad dirty
hump at 500 Hz. |
|
|
2128
|
Sun Mar 11 16:50:59 2018 |
Craig, awade | DailyProgress | scatter | 500 Hz resonant scatter hump in beatnote ASD | After buzzing the table with a probe at
500 Hz, the source of the 500 Hz resonance
is the first steering mirror after the PMC. |
|
|
2135
|
Thu Mar 15 10:29:04 2018 |
awade | DailyProgress | scatter | Addressing 500 Hz scatter pickup | Going back the original issue of scattering,
it appears that there is light being back
reflected from somewhere in the post PMC |
|
|
2149
|
Wed Mar 21 00:40:01 2018 |
Craig | DailyProgress | scatter | The Sentinels: Transmission Table Black Glass Beam Dumps | Scattering is a huge problem in our setup,
and we aren't sure where exactly the
offending scattering is coming from. |
|
|
2150
|
Wed Mar 21 11:07:17 2018 |
awade | DailyProgress | scatter | The Sentinels: Transmission Table Black (Green) Glass Beam Dumps | Which direction are you trying to dump?
Into or out-of the can?
The scatter going inward is being |
|
|
2152
|
Fri Mar 23 15:12:00 2018 |
Craig | DailyProgress | scatter | Powerpoint Trans Table Diagram | This diagram will be for quickly keeping
track of scattering beams/scattering resonances
on the trans table. Need to improve |
|
|
2155
|
Wed Mar 28 11:29:19 2018 |
awade | Notes | scatter | Higher quality vaccan windows: 40m stock of wedged windows | I just checked the 40m's stock of wedged,
AR coated, optics in the pull out draws.
|
|
|
2156
|
Wed Mar 28 15:29:42 2018 |
Koji | Notes | scatter | Higher quality vaccan windows: 40m stock of wedged windows | That was unfortunate. But why does BK7
uncompatible with the purpose? We need UV
fused silica only for the high power reason, |
|
|
2158
|
Thu Mar 29 11:14:52 2018 |
awade | Notes | scatter | Higher quality vaccan windows: 40m stock of wedged windows | I guess BK7 is fine, we're not going
to be putting high power in. I just
though UV fused silica would be better practice |
|
|
2172
|
Mon Apr 16 16:23:09 2018 |
awade | DailyProgress | scatter | Beam size on trans BN detector | I thought I'd have a look at how big
the beam is on the current 1811 New Focus
detector. Over focusing here might be a source |
|
|
2174
|
Thu Apr 19 18:28:11 2018 |
rana | DailyProgress | scatter | Beam size on trans BN detector | This beam is
WAY too big for the PD. If the beam radius |
|
|
2176
|
Sun Apr 22 22:00:15 2018 |
awade | DailyProgress | scatter | Switching out NF1811 detector for KA25MHz | Rather than beating the NF1811 dead horse
any more I've switched it out for the
new KA 26 MHz detector. |
|
|
2403
|
Wed Aug 28 09:49:44 2019 |
anchal | Summary | scatter | Beam Dump Status | We need to switch out normal flat-faced
beam dumps with triangular cavity beam dumps
in all places where they are not present. |
|
|
2528
|
Mon Feb 10 17:41:25 2020 |
anchal | DailyProgress | scatter | Cleaned up table; Installed hex beam dumps | Today I cleaned up the table, removed Scott's
RFAM measurement setup and installed hex
beam dumps on the input rejection of faraday |
|
|
2533
|
Thu Feb 13 18:00:30 2020 |
anchal | DailyProgress | scatter | blocked NF1811 with hex beam dump | I have blocked the unused output port of
the beam splitter before our beatnote detector
with a hex beam dump at (13, |
|