| ID |
Date |
Author |
Status |
Type |
Category |
Location |
Title |
Text |
 |
|
233
|
Fri Mar 21 18:27:36 2025 |
Alice Renaux | Under Process | report | mechanics | lasers and optics | Optical room | 2-mirror cavity alignment | At the beginning of the week, I installed
a half-wave plate, a beamsplitter cube and
a quarter-wave plate, as well as the end-of-cavity |
|
|
234
|
Tue May 27 18:12:22 2025 |
Alice Renaux | Under Process | report | lasers and optics | Optical room | 2-mirror cavity alignment | Yesterday and today, I replaced the OEWaves
CW laser with the NKT CW laser. Its screen
does not display anything, so it has to be |
|
|
235
|
Wed May 28 10:55:15 2025 |
Alice Renaux | Under Process | report | lasers and optics | Optical room | 2-mirror cavity alignment | The NKT laser PZT sensitivity is ~0.09pm/V
of wavelength variation, which is equivalent
to ~ 25MHz/V |
|
|
236
|
Wed May 28 18:27:27 2025 |
Alice Renaux | Under Process | report | lasers and optics | Optical room | 2-mirror cavity full setup | Today with Ronic, we changed the FP cavity's
mirrors to Layertek (Gamma Factory) mirrors
: |
|
|
237
|
Fri Jun 13 20:10:00 2025 |
Alice Renaux | Fixed | report | lasers and optics | Optical room | Damaged mirrors test | Today with Dorian we tested three mirrors
with which we previously haven't been
able to obtain any resonance or optical beating |
|
|
239
|
Thu Aug 28 15:29:00 2025 |
Alice Renaux | Under Process | report | lasers and optics | Optical room | 2-mirror cavity locking | In June, we encountered some problems regarding
the transmission and error signals (see images
here), |
|
|
240
|
Wed Sep 3 18:10:34 2025 |
Alice Renaux | Under Process | report | lasers and optics | Optical room | Successful lock (finally !) | Today, with Ronic, we managed to get a
successful lock with the NKT laser by setting
up a new PDH box from scratch (photodiode |
|
|
242
|
Thu Sep 4 17:52:03 2025 |
Alice Renaux | Under Process | report | lasers and optics | Optical room | Finesse measurement | Today, with Ronic, we measured the finesse
of the 2-mirror cavity witht the NKT CW laser.
We were able to perfrom the measurement |
|
|
243
|
Thu Sep 4 17:56:50 2025 |
Alice Renaux | Under Process | report | lasers and optics | Optical room | Finesse measurement | (Finesse 2651 is consistent with that obtained
from the mirrors' transmission coefficients,
which is about 3100.) |
|
|
244
|
Tue Sep 9 21:23:11 2025 |
Alice Renaux | Under Process | report | lasers and optics | Optical room | new cavity | Yesterday, we changed the M1 mirror to
a 161185 Gamma
Factory mirror of transmission 460ppm, the |
|
|
245
|
Wed Sep 10 11:27:45 2025 |
Alice Renaux | Under Process | report | lasers and optics | Optical room | new cavity | The 2-mirrors cavity has 460ppm of transmission
for M1 and 10ppm for M2 which should exhibit
a Finesse around 13400. |
|
|
33
|
Wed Dec 11 17:13:02 2019 |
Ronic Chiche | Fixed | issue | lasers and optics | Optical room | 2nd stage amplifier issue | the 2nd stage amplifier needed several
hours (4-5h) to reach its nominal power (we
look at photodiode level on a scope), instead |
|
|
34
|
Thu Dec 12 11:49:05 2019 |
Ronic Chiche | Fixed | issue | lasers and optics | Optical room | 2nd stage amplifier issue | Last time, we switched ON directly the
2nd stage at 6A without increasing/decrinsing
slowly the current. |
|
|
35
|
Fri Dec 13 15:56:22 2019 |
Ronic Chiche | Fixed | issue | lasers and optics | Optical room | 2nd stage amplifier issue | 2nd stage output power was going down.
We checked the pump diode technical data
sheet and the operating temperature is [25°C:35°C]. |
|
|
62
|
Tue Jan 12 10:44:57 2021 |
Ronic Chiche | Fixed | issue | lasers and optics | Optical room | Origami SN2440 133MHz laser power measurment... and failure | we received from NKT the Origami SN2440
133MHz oscillator from repair on 2020/12/17
and we measured the power trend from |
|
|
73
|
Mon Apr 4 13:58:23 2022 |
Manar Amer | Fixed | issue | detectors and electronics | utilities | Optical room | Clean Airflow Dust measurements | The dust meter cap was cleaned using Alcohol,
and using the filter white cap the dust count
was (0 Av. 10 min) |
|
|
74
|
Fri Apr 8 19:27:12 2022 |
Manar Amer | Fixed | issue | detectors and electronics | utilities | Optical room | Clean Airflow Dust measurements | Dust measurement done today on top
of the SBox average 10min
|
|
|
144
|
Tue Sep 6 17:47:40 2022 |
Ronic Chiche | Fixed | issue | lasers and optics | Optical room | unsuccessful telescope design :-( | we wanted to calculate the right telescope
with 2 spherical lenses.
1) we have the FP cavity mode size |
|
|
160
|
Mon Sep 12 18:49:42 2022 |
Manar Amer | Fixed | issue | lasers and optics | Optical room | Damage on mirror surface | Following the storage of ~ 50 kW inside
the cavity and a sudden drop in transmitted
power from the cavity |
|
|
161
|
Mon Sep 12 18:50:57 2022 |
Manar Amer | Fixed | issue | lasers and optics | Optical room | Damage on mirror surface | Tomorrow will try to shift the injection
mirror to avoid hitting the damaged spot.
|
|