| ID |
Date |
Author |
Status |
Type |
Category |
Location |
Title |
Text |
 |
|
224
|
Wed Oct 2 10:12:55 2024 |
Ronic Chiche | Under Process | issue | lasers and optics | Optical room | CELIA 100W laser amplifier repair | this morning with Alice, we sent the Menhir
160MHz injected in a fiber (with 6mW at the
end of a long fiber) into the laser amplifier, |
|
|
225
|
Wed Oct 2 18:12:54 2024 |
Ronic Chiche | Under Process | issue | lasers and optics | Optical room | CELIA 100W laser amplifier repair | this afternoon, we saw some electric cables
badly connected to their power supply.
we fixed it by soldering them together |
|
|
230
|
Mon Dec 16 10:20:56 2024 |
Ronic Chiche | Under Process | issue | lasers and optics | Optical room | CELIA 100W laser amplifier repair | friday morning, we add a zoom call with
Jerome Lhermite about the amplifier repair.
he approximately confirmed the amplifier |
|
|
238
|
Mon Jun 23 14:38:33 2025 |
Ronic Chiche | Under Process | issue | mechanics | lasers and optics | detectors and electronics | Optical room | first attempt to lock | With Alice, we installed the EOWaves oscillator
to be locked on the FP-cavity (T1 ~ 2500ppm,
T2 ~ 10ppm => F ~ 2500) |
|
|
1
|
Wed Sep 26 18:12:44 2018 |
Loïc Amoudry | Fixed | info | lasers and optics | Optical room | Cavity polarization states (Koheras), Finesse of 2 polarization states | Measurments of Finesse with the 2 polarization
states, let's call them H (higher) and
L (lower): 24500 for the H and 23500 for |
|
|
18
|
Wed Oct 31 13:51:17 2018 |
Loïc Amoudry | Fixed | info | lasers and optics | Optical room | Change of the 3 ULE mirrors by 3 spare ULE mirrors | First finesse measurement 20 266, FSR 133.351
MHz under vacuum |
|
|
23
|
Thu Nov 15 13:02:44 2018 |
Loïc Amoudry | Fixed | info | lasers and optics | Optical room | Mirrors cleaning | The new mirrors didn't give expected
results. Then the 4 old mirrors have been
sent to LMA on 12/11/18 for a cleaning and |
|
|
24
|
Fri Dec 21 13:42:43 2018 |
Loïc Amoudry | Fixed | info | lasers and optics | Optical room | Mirrors features, come back from LMA | Mirrors arrived today from LMA. Their features
are damaged.
Photos avant ou après nettoyage, |
|
|
28
|
Fri Feb 1 14:04:27 2019 |
Loïc Amoudry | Fixed | info | lasers and optics | Other | Meeting with LMA people, AFM | 30/01/19 - The following powerpoint
shows the results discussed with LMA people.
What came out from the discussion |
|
|
58
|
Wed Jun 19 18:54:00 2019 |
Huan Wang | Fixed | info | lasers and optics | Optical room | amplifier | Onefive output power is 24mW now, and 2.41mW(after
EOM) injected into fiber,
a injection power monitor |
|
|
59
|
Mon Jun 24 16:15:08 2019 |
Huan Wang | Fixed | info | lasers and optics | Optical room | amplifier | I just had a phone call with Jérome
and he told me 2 things :
* Be carefull ! the MightyLaser |
|
|
32
|
Tue Dec 10 09:36:56 2019 |
Ronic Chiche | Fixed | info | lasers and optics | Optical room | FSR and Finesse measurement | Yesterday the cavity has been aligned and
locked with the CW Koheras laser.
the FSR has been measured by modulation |
|
|
37
|
Tue Dec 17 10:46:24 2019 |
Ronic Chiche | Fixed | info | lasers and optics | Optical room | Beam size behind M2 | Beam diameter behind M2 :
- 2nd stage @ 6A - 1kW inside cavity
sx = 2120 µm |
|
|
39
|
Tue Dec 17 12:16:54 2019 |
Ronic Chiche | Fixed | info | lasers and optics | Optical room | Optical amplifier polarization state | We placed a PBS + 2 photodiodes (PhD1,
PhD2) at the output of the amplifier to check
how the polarization of the amplifier changes |
|
|
40
|
Tue Dec 17 17:54:38 2019 |
Ronic Chiche | Fixed | info | lasers and optics | Optical room | Optical amplifier polarization state | The
polarimeter was giving a strange 50% of DOP
of the light coming from the cavity. |
|
|
41
|
Tue Dec 17 17:58:12 2019 |
Ronic Chiche | Fixed | info | lasers and optics | Optical room | Beam size behind M2 | the telescope matchs the cold cavity beam,
so it is normal to have a power decrease
on the transmission photodiode when the cavity |
|
|
42
|
Thu Dec 19 09:21:45 2019 |
Ronic Chiche | Fixed | info | lasers and optics | Optical room | Optical amplifier polarization state | polarization state of the cavity at higher
power : 20kW, 30kW and 33kW (slight
CEP and alignment optimization) : |
|
|
44
|
Thu Dec 19 16:03:17 2019 |
Ronic Chiche | Fixed | info | lasers and optics | Optical room | Beam size behind M2 | Yesterday, we tried to better adapt positions
of the telescope lenses, dynamically, during
the lock, to improve the matching between |
|
|
45
|
Thu Dec 19 16:23:39 2019 |
Ronic Chiche | Fixed | info | lasers and optics | Optical room | Cavity beam axis moving with power | how the cavity beam axis is moving during
a lock when the cavity is hot ?
could it explain a part of the Transmission |
9x |
|
50
|
Fri Jan 24 17:56:11 2020 |
Loïc Amoudry | Fixed | info | lasers and optics | Optical room | AFM analysis of M2 | We had enough time to proceed a quick scan
of M2 which has also a hole but not centered
on the mirror. |
|