| ID |
Date |
Author |
Status |
Type |
Category |
Location |
Title |
Text |
 |
|
263
|
Mon Sep 18 12:48:39 2023 |
Ronic Chiche | Fixed | issue | mechanics | lasers and optics | detectors and electronics | ThomX igloo | !!! strange FP cavity behavior => impossible to lock !!! | this morning, we tried:
- to move a bit the arm of the
L-shape off the beam axis (in case of it |
|
|
262
|
Fri Sep 15 19:13:44 2023 |
Ronic Chiche | Fixed | info | lasers and optics | ThomX igloo | drift calculation for the SMA100A | the goal is to estimate what could be the
frequency drift at 500MHz for the SMA100A:
see phase noise datasheet in attachement |
|
|
261
|
Fri Sep 15 18:56:36 2023 |
Ronic Chiche | Fixed | issue | mechanics | lasers and optics | detectors and electronics | ThomX igloo | !!! strange FP cavity behavior => impossible to lock !!! | suddenly, BEFORE switching the HV amplifier
ON and BEFORE connecting it to the EOM (in
order to explore the HV effect on the EOM |
|
|
260
|
Fri Sep 15 18:27:24 2023 |
Ronic Chiche | Fixed | info | lasers and optics | detectors and electronics | ThomX igloo | Fast feedback loop between laser and FP cavity | this afternoon, we tried to better understand
how to drive properly the EOM to kill high
frequency noise. |
|
|
259
|
Fri Sep 15 18:11:07 2023 |
Ronic Chiche | Under Process | issue | mechanics | lasers and optics | detectors and electronics | ThomX igloo | 20Hz oscillation in the locking between Laser and FP-cavity | this afternoon, we did 2 tests to better
understand this 20Hz oscillation:
- we locked the amplified laser |
|
|
258
|
Fri Sep 15 18:00:41 2023 |
Ronic Chiche | Under Process | issue | mechanics | lasers and optics | detectors and electronics | ThomX igloo | 20Hz oscillation in the locking between Laser and FP-cavity | this morning, we tried to find the origin
of the 20Hz oscillation.
- we switched OFF the laser Smaract |
|
|
257
|
Thu Sep 14 19:16:44 2023 |
Ronic Chiche | Fixed | info | detectors and electronics | Optical room | lock oscillateur 33MHz - synthé 500MHz | this afternoon, we were able to lock the
laser on the FP-cavity and the FP-cavity
on the Ring reference oscillator in a same |
|
|
256
|
Wed Sep 13 18:33:50 2023 |
Ronic Chiche | Fixed | info | detectors and electronics | Optical room | lock oscillateur 33MHz - synthé 500MHz | this afternoon, I firstly connected the
HV output of the Laselock to the FP-cavity
PZT : https://elog.lal.in2p3.fr/FPC/THOMX+commissioning/248 |
|
|
248
|
Wed Sep 13 17:57:08 2023 |
Ronic Chiche | Fixed | issue | lasers and optics | detectors and electronics | ThomX igloo | work with HV voltage on the Laselock | This afternoon, I connected the HV output
of the Laselock (instead of the standard
0-10V output) to the FP-cavity PZT to increase |
|
|
255
|
Wed Sep 13 12:24:14 2023 |
Ronic Chiche | Fixed | info | detectors and electronics | Optical room | lock oscillateur 33MHz - synthé 500MHz | this morning, I added a Thorlabs lowpass
filter at 1kHz after the mixer and a resistor
at the Laselock output to the FP-cavity PZT. |
|
|
254
|
Tue Sep 12 17:58:41 2023 |
Ronic Chiche | Fixed | info | detectors and electronics | Optical room | lock oscillateur 33MHz - synthé 500MHz | this afternoon, I tried to lock the FP-cavity
on a local 500MHz synthesizer as a frequency
reference |
|
|
245
|
Tue Sep 12 14:28:36 2023 |
Ronic Chiche | Fixed | info | mechanics | lasers and optics | detectors and electronics | ThomX igloo | Removing high order modes | yesterday with Daniele, we tried again
to move the arm horizontally and vertically
from the "zero position" to have |
|
|
244
|
Fri Sep 8 19:45:56 2023 |
Ronic Chiche | Fixed | info | lasers and optics | ThomX igloo | 33MHz oscillator + Alphanov amplifier lock | redoing the PDH error signal scheme with
discrete components is more flexible and
it is easier to check the signal/noise ratio. |
|
|
253
|
Fri Sep 8 19:35:36 2023 |
Ronic Chiche | Fixed | info | detectors and electronics | Optical room | lock oscillateur 33MHz - synthé 500MHz | this afternoon, I installed the frequency
detection scheme in the bunker :
- I changed the large reflected |
|
|
242
|
Fri Sep 8 18:22:21 2023 |
Ronic Chiche | Fixed | info | mechanics | lasers and optics | detectors and electronics | ThomX igloo | Removing high order modes | here is the picture of the L-shape arm
and the inside of the vessel.
this image corresponds to the "zero" |
|
|
241
|
Fri Sep 8 12:43:04 2023 |
Ronic Chiche | Fixed | info | mechanics | lasers and optics | detectors and electronics | ThomX igloo | Removing high order modes | this morning we locked the laser and the
FP-cavity with ~ 40kW => some HOM appeared
"randomly" depending on the power. |
|
|
240
|
Thu Sep 7 19:23:36 2023 |
Ronic Chiche | Fixed | info | lasers and optics | detectors and electronics | ThomX igloo | Fast feedback loop between laser and FP cavity | today, after the several unsuccessful attempt
yesterday to get an improvement in the lock,
we decided to "rebuild" |
|
|
239
|
Thu Sep 7 18:51:43 2023 |
Ronic Chiche | Fixed | issue | lasers and optics | ThomX igloo | Onefive laser modelock and Smaract CEP controller | today, during an attempt in improving the
CEP with the Smaract controller CH2, we lost
the laser modelock. |
|
|
238
|
Wed Sep 6 20:09:56 2023 |
Ronic Chiche | Fixed | info | lasers and optics | ThomX igloo | Smaract controller remplacement | previously, we were using a spare Smaract
MCS controller to drive the Onefive linear
stages (without -LV -low vibration- |
|
|
237
|
Wed Sep 6 19:57:48 2023 |
Ronic Chiche | Fixed | info | lasers and optics | detectors and electronics | ThomX igloo | Fast feedback loop between laser and FP cavity | today, we tried to lock the FP cavity with
the Smaract motors ON (with option -LV).
we know the Smaract controllers produce |
|