| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
1927
|
Tue Oct 19 13:52:03 2021 |
Radhika | DailyProgress | 1418 nm AUX ECDL | 1418nm ECDL Frequency noise | |
|
|
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 |
|
|
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 |
|
|
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. |
|
|
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 |
|
|
1922
|
Wed Sep 1 13:12:02 2021 |
Radhika | DailyProgress | 1418 nm AUX ECDL | 1419 nm ECDL AOM diffraction at 95 MHz | |
|
|
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. |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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. |
|
|
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 --> |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
1900
|
Thu Feb 4 16:46:06 2021 |
Paco | DailyProgress | Optics | OPO cavity lock | Demodulation stage
Update on
demod. for OPO cavity lock. Last
related elog entry described prevalence |
|
|
1899
|
Tue Feb 2 17:39:52 2021 |
Paco | DailyProgress | Optics | re: Figuring out how much astigmatism is hurting us | Motivated in part by the conclusions below,
improved estimated mode matching efficiency
from a poor 13% at the beginning of day to |
|
|
1898
|
Tue Feb 2 10:32:25 2021 |
Anchal | Summary | Optics | Figuring out how much astigmatism is hurting us | Methods
Use
the actual measured beam profile in X and
Y directions.
Propagate them with |
|
|
1897
|
Tue Jan 26 11:47:12 2021 |
Paco | DailyProgress | General | low quality PDH error signal | After getting what looked like a decent
cavity reflection signal, installed RFPD
yesterday. For this, removed the lens that |
|
|
1896
|
Tue Jan 26 11:34:51 2021 |
rana | DailyProgress | Optics | Included lens made by cavity input mirror and distrotion due to crystal | would be good if you could find a solution
that is not very sensitive to precise lens
placement |
|
|
1895
|
Tue Jan 26 11:33:32 2021 |
rana | DailyProgress | Optics | Included lens made by cavity input mirror and distrotion due to crystal |
|
|
|
1894
|
Fri Jan 15 17:21:53 2021 |
Paco | DailyProgress | Electronics | RFPD TF | Record TF for RFPD SN09, resonant at 36
MHz, using the exact procedure as with EOM
Resonant Driver. |
|
|
1893
|
Fri Jan 15 10:57:39 2021 |
Paco | Lab Infrastructure | EquipmentLoan | Borrow AG4395A and EOM Driver TF re-tune | See equipment borrowing note here.
Attempting TF measurement for resonant
EOM driver, but not having luck reproducing |
|
|
1892
|
Wed Jan 13 17:52:35 2021 |
Paco | DailyProgress | Optics | OPO cavity resonance | Observed first resonant transmitted (&
reflected) light from the DOPO cavity; the
PZT scan was centered at 31 V, at 2 Hz, with |
|
|
1891
|
Fri Jan 8 17:17:19 2021 |
Anchal | DailyProgress | Optics | Included lens made by cavity input mirror and distrotion due to crystal | Error in previous calculations:
We did not take into account
the effect of cavity input mirror on the |
|
|
1890
|
Fri Jan 8 17:00:26 2021 |
Anchal | DailyProgress | Optics | Included lens made by cavity input mirror and distrotion due to crystal |
|
|
|
1889
|
Thu Jan 7 17:09:16 2021 |
Paco & Anchal | DailyProgress | Optics | Mode matching OPO | Fresh attempt at mode matching. For this,
Installed the oven, plugged
it to the controller and went to the nominal |
|
|
1888
|
Thu Jan 7 09:44:52 2021 |
Paco | DailyProgress | Optics | Shaping the OPO cavity mode | Summary of solution number 2 (from previous
post).
After installing the lenses, mirrors |
|
|
1887
|
Wed Jan 6 09:34:34 2021 |
Anchal | DailyProgress | Optics | Corrected analysis and found better solutions. | Errors in the previous analysis
Previously,
we wrongly assumed. that the reflected light
from the cavity would be as if a reflection |
|
|
1886
|
Thu Dec 31 16:41:59 2020 |
Anchal | DailyProgress | Optics | Mode matching solution for Cavity | Goals and restrictions:
Use
the fewest lenses as possible.
The
beam widths in both onward and reflection |
|
|
1885
|
Wed Dec 30 09:57:56 2020 |
Paco | DailyProgress | Optics | DOPO crystal oven | Assembled first DOPO oven with the crystal.
The components (shown below) are:
Oven clip
Oven
ITO |
|
|
1884
|
Mon Dec 28 15:51:51 2020 |
Anchal | DailyProgress | Optics | Mode matching solution for Cavity | Goals and restrictions:
Use the fewest lenses as
possible.
The beam widths in both |
|
|
1883
|
Wed Dec 23 15:43:01 2020 |
Paco | DailyProgress | | OPO cavity assembly | Laseroptik optics (4x pairs of cavity mirrors)
arrived earlier this week, so I began assembling
the input mirror with Noliac (NAC2124) PZT. |
|
|
1882
|
Tue Dec 22 15:54:03 2020 |
Anchal | DailyProgress | Optics | Took beam profile of near EOM area |
After installing a 400mm focal
length plano-convex lens at 24" from
the laser head at (20, 12), we found that |
|