| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
1901
|
Fri Feb 5 14:15:22 2021 |
rana | DailyProgress | Optics | OPO cavity lock | For the splitting, I recommend not to use
a splitter.
Instead, you can use a -10 or -20 |
|
|
1902
|
Wed Feb 17 11:56:48 2021 |
Paco | Lab Infrastructure | Electronics | UPDH box zero model and SR560 "lock" | UPDHv3 box (serial 17142) is bogus. While
retrieving values of some of the components
to plug into working zero model, saw the |
|
|
1903
|
Thu Feb 18 09:39:01 2021 |
Paco | DailyProgress | Electronics | PDH error signal misbehaving | Error signal
Upon closer inspection
the error signal seems to vary quite significantly
on the scope (scanning @ 2 Hz), sometimes |
|
|
1904
|
Wed Feb 24 17:42:49 2021 |
Paco | DailyProgress | General | DOPO locking and SHG | Locking update
The plan during
these past few days has been to have fast
control loop of the cavity (locked to laser |
|
|
1905
|
Thu Feb 25 10:28:07 2021 |
Paco | DailyProgress | Optics | DOPO lock endurance | Test long term stability of the DOPO cavity
lock; The cavity remained resonant overnight
(start ~ 8 PM yesterday) and lost around |
|
|
1906
|
Tue Mar 9 19:21:38 2021 |
Paco | Misc | Optics | DOPO cavity pole | - Noticed that the cavity transmission
peaks @ 1064 nm were much wider than originally
estimated by the dopo cavity design |
|
|
1907
|
Tue Mar 30 15:18:06 2021 |
Paco | Lab Infrastructure | EquipmentLoan | 2um CCD borrowed | With Aidan's assistance, I borrowed
WiDy SWIR camera (Pembroke
WiDy SWIR 640U-A) from the QIL (Attachment |
|
|
1908
|
Wed Apr 14 16:49:30 2021 |
Paco | Misc | Optomechanics | DOPO mount v2 | Drew some new mounting scheme for the DOPO
cavity; main revisions with respect to the
current mount are --> |
|
|
1909
|
Tue May 18 10:28:50 2021 |
Paco | Lab Infrastructure | EquipmentLoan | heimann sensor update | Heimann (HTPA80x64d) thermopile array;
-
First test to grab frames was done in my
personal Win10 machine, with no success. |
|
|
1910
|
Wed May 19 09:25:34 2021 |
Paco | Noise Hunting | DOPO | 316 Hz noise | [Paco]
- Have been investigating 316 Hz
noise in the control signal for the DOPO |
|
|
1911
|
Thu May 20 17:09:43 2021 |
Koji | Summary | General | Another Heimann Sensor | Another Heimann Sensor / Boston Electronics
delivered to Paco.
This unit (purchased May 2020/ / Delivered |
|
|
1912
|
Wed Jun 2 18:37:09 2021 |
Paco | Summary | Crackle | Vent crackle experiment | [Paco, Anchal, Ian, Yehonathan]
Today, in preparation for the optical
table to come, we vented the big crackle |
|
|
1913
|
Thu Jun 10 09:59:52 2021 |
Paco | Lab Infrastructure | DOPO | Disassembly for new optical table | Today the DOPO v0 got disassembled to make
way for the optical table swap. Most components
have been stored in the white cabinet's |
|
|
1914
|
Wed Jul 7 13:05:07 2021 |
Paco | DailyProgress | 1418 nm AUX ECDL | New aspheric flexures | [Radhika, Paco]
Today we fired up the 1418 nm ECDL
and attempted initial adjustment of the aspheric |
|
|
1915
|
Fri Jul 9 11:40:42 2021 |
Paco | DailyProgress | 1418 nm AUX ECDL | New aspheric flexures | [Radhika, Paco]
We tweaked the flexure alignment
until we had a nominally collimated beam |
|
|
1916
|
Wed Jul 14 12:21:08 2021 |
Paco | DailyProgress | 1418 nm AUX ECDL | ECDL lases... and MZ locked mid-fringe | [Paco]
Worked for a few hours to get the
aspheric properly aligned. The procedure |
|
|
1917
|
Wed Aug 4 11:36:30 2021 |
Radhika | DailyProgress | 1418 nm AUX ECDL | 1419 nm ECDL with 2um AOM tests | [Radhika, Paco]
In order to transition the ECDL
laser noise characterization to a heterodyne |
|
|
1918
|
Tue Aug 10 09:51:44 2021 |
Paco | DailyProgress | 1418 nm AUX ECDL | 1419 nm ECDL AOM diffraction at 95 MHz | [radhika, paco]
We changed the setup to use a low
power amplifier rather than the 5W amp from |
|
|
1919
|
Tue Aug 10 11:00:43 2021 |
Paco | DailyProgress | DOPO | DOPO v2 | [paco, nina]
We started rebuilding the DOPO
in the lab even though the new optical table |
|
|
1920
|
Thu Aug 12 11:49:59 2021 |
Radhika | DailyProgress | 1418 nm AUX ECDL | 1419 nm ECDL AOM diffraction at 95 MHz | [Paco, Radhika]
When previously trying to characterize
the AOM, we had noticed no 1st order diffraction |
|
|
1921
|
Tue Aug 17 11:09:29 2021 |
rana | DailyProgress | 1418 nm AUX ECDL | 1419 nm ECDL AOM diffraction at 95 MHz | Should measure the S-matrix using a bi-directional
coupler. |
|
|
1922
|
Wed Sep 1 13:12:02 2021 |
Radhika | DailyProgress | 1418 nm AUX ECDL | 1419 nm ECDL AOM diffraction at 95 MHz | |
|
|
1923
|
Thu Sep 2 17:31:38 2021 |
Radhika | DailyProgress | 1418 nm AUX ECDL | 1418 nm ECDL Relative Intensity Noise | I took a relative intensity noise (RIN)
measurement of the ECDL, by feeding the 0th
order output of the AOM to the SR785. The |
|
|
1924
|
Thu Sep 16 15:21:21 2021 |
Paco | DailyProgress | 1418 nm AUX ECDL | Free space AOM | [Paco, Radhika]
Uninstalled the fiber AOM and temporarily
removed the third fiber 2x2 port beamsplitter. |
|
|
1925
|
Wed Sep 22 16:44:34 2021 |
Radhika | DailyProgress | 1418 nm AUX ECDL | Free space AOM | [Paco, Radhika]
We had previously noticed that
the ECDL laser power seemed weaker compared |
|
|
1926
|
Mon Oct 4 17:44:34 2021 |
Radhika | DailyProgress | 1418 nm AUX ECDL | Free space AOM | [Paco, Radhika]
Last Friday we received a new lens
to direct the AOM 1st-order beam from |
|
|
1927
|
Tue Oct 19 13:52:03 2021 |
Radhika | DailyProgress | 1418 nm AUX ECDL | 1418nm ECDL Frequency noise | |
|
|
1928
|
Tue Mar 8 09:32:56 2022 |
Paco | DailyProgress | 1418 nm AUX ECDL | 1418nm ECDL Frequency noise | [Paco, Radhika]
Beatnote recovery
Restarted
ECDL characterization last Friday. After |
|
|
1929
|
Thu Jun 23 16:34:46 2022 |
Paco | Lab Infrastructure | DOPO | Relocated DOPO setup | Following Koji's request, I took some
time to clear the area surrounding the crackle
chamber so it can be migrated to the former |
|
|
1930
|
Tue Jan 10 23:40:17 2023 |
Koji | Lab Infrastructure | General | Heavy item transport - preparation | See http://nodus.ligo.caltech.edu:8080/Mariner/121 |
|
|
1931
|
Thu Jan 12 11:51:49 2023 |
Koji | Lab Infrastructure | General | How to move the large engine hoist through the narrow door | How to move the large engine hoist through
the narrow door
See http://nodus.ligo.caltech.edu:8080/Mariner/122 |
|
|
1932
|
Thu Jul 20 12:57:38 2023 |
aaron | Misc | EquipmentLoan | AOM to cryo lab | I returned the Gooch & Housego R26035-2-1.55-LTD
AOM (SN 216939) from DOPO table |
|
|
1933
|
Mon Sep 25 15:56:17 2023 |
Paco | Lab Infrastructure | 1418 nm AUX ECDL | 2nd ECDL housing assembled | I assembled the second ECDL with a 19XX
SAF gain chip (all pins remain disconnected),
and a 14XX nm angle facet plate with a grating. |
|
|
1934
|
Tue Oct 17 22:11:21 2023 |
murtaza | Summary | SUS | Triple Suspension Simulation | I attempted a matlab simulation for closing
the loops on the triple suspensions. The
system (hsts) was imported from https://git.ligo.org/jenne-driggers/SUS. |
|
|
1935
|
Wed Oct 18 11:51:55 2023 |
murtaza | Summary | SUS | Triple Suspension Simulation | Closer look at the damping siutation.
tldr: Corrected electronics gain,
Signs of filters flipped, AND THE CORRECT |
|
|
1936
|
Thu Oct 19 18:22:21 2023 |
murtaza | Summary | SUS | Triple Suspension Simulation | Jeff
Kissel:
|
|
|
1937
|
Fri Oct 20 12:13:00 2023 |
murtaza | Summary | SUS | Triple Suspension Simulation | I made some changes to the plots
tldr:
- collected the linear and angular |
|
|
1938
|
Mon Oct 23 16:52:54 2023 |
murtaza | Summary | SUS | Triple Suspension Simulation | A velocity damping filter with of the following
form: zpk(0, 2*pi*[-20, -20], 100) was applied
to the Length DOF while the remaining filters |
|
|
1939
|
Fri Oct 27 01:00:37 2023 |
murtaza | Summary | SUS | Triple Suspension Simulation | With the following goals:
- 10x lower noise magnitude than
the current filter design in the 10-20Hz |
|
|
1940
|
Sat Oct 28 22:46:55 2023 |
Paco | Lab Infrastructure | EquipmentLoan | Thorlabs HV pzt driver | I took the Thorlabs PZT driver to the 40m
for use with the BHD OMC. |
|
|
1941
|
Mon Oct 30 12:08:35 2023 |
murtaza | Summary | SUS | Triple Suspension Simulation | PR3 Livingston Filter
Design (LONGITUDINAL DOF)
|
|
|
1942
|
Tue Oct 31 14:14:52 2023 |
murtaza | Summary | SUS | Triple Suspension Simulation | PR3
Livingston Filter Design (PITCH DOF)
tldr: |
|
|
1943
|
Fri Nov 3 16:43:26 2023 |
murtaza | Summary | SUS | Triple Suspension Simulation | PR3
Trial Filter Design |
|
|
1944
|
Thu Nov 9 12:56:10 2023 |
murtaza | Summary | SUS | Triple Suspension Simulation | DATA
ACQUISITION (FILTER MODULES) FROM LIVINGSTON |
|
|
1945
|
Mon Nov 13 14:52:29 2023 |
murtaza | Summary | SUS | Triple Suspension Simulation | Triple
Suspension DAMP_OUT Spectrum (Livingston)
tldr: |
|
|
1946
|
Mon Nov 13 17:39:12 2023 |
murtaza | Summary | SUS | Triple Suspension Simulation | Triple
Suspension Test Mass Displacement Spectrum (Livingston)
[WIP] |
|
|
1947
|
Tue Nov 14 16:14:11 2023 |
rana | Misc | Noise Budget | triples | we only care about PRM, PR2, PR3, BS, SR3,
SR2, SRM, so you should eliminate all other
optics from the plots. |
|
|
1948
|
Tue Nov 14 22:18:15 2023 |
murtaza | Misc | Noise Budget | triples | The spectra
for damp out for the following optics
- small triples {PR2, PRM, SR2, |
|
|
1949
|
Wed Nov 15 09:48:05 2023 |
rana | Misc | Noise Budget | triples | Can you explain how you calibrated the
control signals into displacement units?
It would be fine to start if you could just |
|
|
1950
|
Thu Nov 16 13:15:06 2023 |
murtaza | Misc | Noise Budget | triples | Small
Triple Suspension Trial Filter Design
tldr: |
|