| ID |
Date |
Author |
Status |
Type |
Category |
Location |
Title |
Text |
 |
|
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) : |
|
|
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 |
|
|
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. |
|
|
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 |
|
|
38
|
Tue Dec 17 10:56:08 2019 |
Ronic Chiche | Fixed | report | lasers and optics | Optical room | first data with 3A on the 3rd stage | 2 pictures :
typical beam with HOM
typical beam after moving the D-shape |
|
|
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 |
|
|
36
|
Fri Dec 13 18:28:00 2019 |
Ronic Chiche | Fixed | report | lasers and optics | Optical room | first data with 3A on the 3rd stage | Today, at 3A on the 3rd stage, we saw some
HOM effects.
the transmissions is about 100mW which |
|
|
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]. |
|
|
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. |
|
|
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 |
|
|
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 |
|
|
31
|
Fri Dec 6 11:54:58 2019 |
Loïc Amoudry | Fixed | report | lasers and optics | Optical room | Mirror's installed | The initial 400kW SBOX mirrors which have
been cleaned ont 28th of november have been
installed this morning on the SBOX. |
|
|
30
|
Fri Dec 6 11:53:53 2019 |
Loïc Amoudry | Fixed | report | lasers and optics | Optical room | Mirror's cleaning | XPS has been proceeded on the 400kW SBOX
mirrors M3 and M4 (the initial cavity spherical
mirrors) in frebruary 2019. Deposited a lot |
|
|
29
|
Wed Nov 13 13:15:53 2019 |
Loïc Amoudry | Fixed | report | lasers and optics | Other | AFM+ InfraRed spectroscopy (IR spectro) has been performed | AFM+ InfraRed spectroscopy (IR spectro)
has been performed on 400kW S-BOX mirrors.
Seems that XPS made M3 and M4 dirty, |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
27
|
Fri Feb 1 13:45:19 2019 |
Loïc Amoudry | Fixed | report | lasers and optics | Other | AFM performed on S-BOX mirrors | 29/02/19 - AFM has shown that spots
on mirror's surfaces are bumps and not
holes. |
|
|
26
|
Thu Jan 24 17:49:54 2019 |
Loïc Amoudry | Fixed | report | lasers and optics | Optical room | Impacts on mirror's surface | All the mirrors show impacts on there surface
(some of them do not show deposit). Does
it come from experiments or fabrication ? |
|
|
25
|
Thu Jan 24 17:44:21 2019 |
Loïc Amoudry | Fixed | report | lasers and optics | Optical room | Deposit on S-box mirrors after return from LMA | Cleaning on dirty surface shows something
is deposited on the surface. Cleaning displaces
and removes part of the deposit. |
|