| ID |
Date |
Author |
Status |
Type |
Category |
Location |
Title |
Text |
 |
|
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. |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
264
|
Mon Sep 18 17:12:07 2023 |
Ronic Chiche | Fixed | issue | mechanics | lasers and optics | detectors and electronics | ThomX igloo | !!! strange FP cavity behavior => impossible to lock !!! | it could be also an optical unstability,
as when the intra-cavity power increases,
the radius of curvatures of the mirrors increases |
|
|
265
|
Wed Sep 20 14:16:09 2023 |
Ronic Chiche | Fixed | issue | mechanics | lasers and optics | detectors and electronics | ThomX igloo | !!! strange FP cavity behavior => impossible to lock !!! | This morning,
- I installed the fast feedback
loop. |
|
|
266
|
Wed Sep 20 19:10:16 2023 |
Ronic Chiche | Fixed | issue | mechanics | lasers and optics | detectors and electronics | ThomX igloo | !!! strange FP cavity behavior => impossible to lock !!! | this afternoon, in adjusting the CEP and
improving the parameters of the lock, I was
able to get ~ 47kW stable inside the cavity, |
|
|
269
|
Thu Sep 21 18:56:56 2023 |
Ronic Chiche | Fixed | issue | mechanics | lasers and optics | ThomX igloo | !!! strange amplifier beam pointing fluctuations !!! | this morning, I locked the cavity to ~25kW
without any problem.
but this afternoon, the reflected |
|
|
273
|
Wed Nov 8 17:51:30 2023 |
Ronic Chiche | Fixed | issue | mechanics | lasers and optics | ThomX igloo | !!! strange amplifier beam pointing fluctuations !!! | we confirmed the effect of the bunker temperature
on the laser amplifier "beam pointing"
fluctuations. |
|
|
287
|
Thu Nov 23 12:25:07 2023 |
Ronic Chiche | Fixed | issue | mechanics | lasers and optics | detectors and electronics | ThomX igloo | Temperature control of the FP-cavity length | as the CFP motors displacements induce
a cavity unlock, we try to change the cavity
length by changing the temperature of elment |
|
|
288
|
Thu Nov 23 12:26:26 2023 |
Ronic Chiche | Fixed | issue | lasers and optics | ThomX igloo | Temperature control of the Laser length with the inside Peltier |
bunker temperature @ 22.5°C
today, Sebastien Pitrel improved |
|
|
294
|
Tue Nov 28 18:38:16 2023 |
Ronic Chiche | Fixed | issue | mechanics | lasers and optics | detectors and electronics | ThomX igloo | Temperature control of the FP-cavity length | several days ago, we installed a heating
cable around the output flange (close to
the X-hutch) of the FP-cavity vessel. |
|
|
297
|
Wed Nov 29 12:20:18 2023 |
Ronic Chiche | Fixed | issue | mechanics | lasers and optics | detectors and electronics | ThomX igloo | Temperature control of the FP-cavity length | today, I removed one of the DC voltage
supply (as with 30V, we are already able
to 30°C on the heating cable). |
|
|
301
|
Thu Nov 30 15:53:10 2023 |
Ronic Chiche | Fixed | issue | mechanics | lasers and optics | detectors and electronics | ThomX igloo | Temperature control of the FP-cavity length | this afternoon, I started the heating cable after
the warm-up of the FP-cavity :
14h20 : start to fill 50kW |
|
|
302
|
Mon Dec 4 10:45:50 2023 |
Ronic Chiche | Fixed | issue | mechanics | lasers and optics | detectors and electronics | ThomX igloo | Temperature control of the FP-cavity length | last friday, I locked the cavity and then,
switched ON the heating cable after waiting
the cavity reaches a steady state in frequency |
|
|
304
|
Thu Dec 7 14:59:02 2023 |
Ronic Chiche | Fixed | issue | mechanics | lasers and optics | detectors and electronics | ThomX igloo | Temperature control of the FP-cavity length | on last tuesday, I did a long-term measurement
of the frequency drift when the heating cable
is powered ON at 20V (2x 10V) @ t=0mn. |
|
|
306
|
Mon Dec 11 17:21:32 2023 |
Ronic Chiche | Fixed | issue | mechanics | lasers and optics | detectors and electronics | ThomX igloo | Temperature control of the FP-cavity length | today with Fatematuj, we did a long-term
frequency drift measurement between the FP-cavity
loaded with 50kW and the RF reference frequency... |
|
|
324
|
Fri Feb 9 09:50:45 2024 |
Ronic Chiche | Under Process | issue | mechanics | lasers and optics | detectors and electronics | ThomX igloo | 20Hz oscillation in the locking between Laser and FP-cavity | yesterday I did 2 tests to try to understand
the origin of the 20Hz oscillation which
is dominant in the remaining 10-20ps rms |
|