| ID |
Date |
Author |
Status |
Type |
Category |
Location |
Title |
Text |
 |
|
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. |
|
|
49
|
Fri Jan 24 17:52:14 2020 |
Loïc Amoudry | Fixed | report | lasers and optics | Optical room | AFM analysis of M1 | AFM has been proceeded on M1 and M2.
The pdf shows the first images
taken with the PLIC room Leica microscope |
|
|
48
|
Fri Jan 24 16:16:24 2020 |
Ronic Chiche | Fixed | report | lasers and optics | Optical room | analysis of stored and reflected power | A chart which summarizes
the data we have or we can estimate.
|
|
|
47
|
Fri Jan 10 18:51:23 2020 |
Ronic Chiche | Fixed | report | lasers and optics | Optical room | analysis of stored and reflected power | the 10th of January, we increased the power
of the amplifier to study the cavity transmitted
and reflected power signals. |
6x |
|
46
|
Thu Jan 9 16:54:05 2020 |
Loïc Amoudry | Fixed | report | lasers and optics | Optical room | Microscope and cleaning of SBOX mirrors | The mirrors went in the cavity the 28th
of november (We did several power up
to 30kW stored and only one to 40kW then |
|
|
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 |
|
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 |
|
|
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 |
|