| ID |
Date |
Author |
Status |
Type |
Category |
Location |
Title |
Text |
 |
|
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" |
|
|
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. |
|
|
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 |
|
|
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 |
|
|
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. |
|
|
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 |
|
|
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 |
|
|
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, |
|
|
267
|
Wed Sep 20 19:12:16 2023 |
Ronic Chiche | Fixed | info | lasers and optics | detectors and electronics | ThomX igloo | Fast feedback loop between laser and FP cavity | I copy the post about Fast Feedback loop
: https://elog.lal.in2p3.fr/FPC/THOMX+commissioning/265
This morning, |
|
|
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 |
|
|
271
|
Mon Oct 9 13:11:23 2023 |
Daniele Nutarelli | Fixed | info | lasers and optics | ThomX igloo | Tests of pointing stability of the laser CFP | Last monday with Victor we have cheked
the stability of de pointing of the laser
FP. |
|
|
272
|
Tue Nov 7 14:09:25 2023 |
Ronic Chiche | Fixed | info | lasers and optics | ThomX igloo | Strecher and fiber injection alignment | Today, the power measured at the input
of the amplifier (PD_IN on the LAL amplifier
software) is 2.5mW instead of >3mW generally |
|
|
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. |
|
|
274
|
Wed Nov 8 18:52:44 2023 |
Ronic Chiche | Fixed | info | lasers and optics | detectors and electronics | ThomX igloo | some changes in the feedback scheme | from several weeks, the maximum power stored
in the FP-cavity was ~ 5kW.
today with Daniele, we finished |
|
|
275
|
Thu Nov 9 16:40:16 2023 |
Ronic Chiche | Fixed | info | mechanics | lasers and optics | detectors and electronics | ThomX igloo | Ring frequency / Laser "day by day" locking | today, the equivalent Smaract position
corresponding to the 500.25MHz ring frequency
is +156µm on MCS-1/ch0 (closed loop |
|