Divergence of the CW beam after collimator , posted by Manar Amer at Optical room about lasers and optics
|
Closing the series of the telescope for the beam @ 133.33 MHz
|
Images of ThomX mirrors , posted by Manar Amer at Optical room about lasers and optics 
|
Under the microscope,
the spherical mirrors show the deposit of metal dots on the reflecting surface and not on the back of the mirrors
The mirror with fewer spots near the center was used in the setup. |
|
Images of ThomX mirrors , posted by Manar Amer at Optical room about lasers and optics
|
Mirror images in the previous log showing the metal deposit of the coating of the spherical mirrors
(not sent by mail due to large size of images)
Manar |
|
Pulse duration measurement before and after CVBG (as a strecher), posted by Ronic Chiche at Optical room about lasers and optics
|
I recorded the pulse shape of the MENHIR 216MHz in its fiber injection setup.
the fiber is then connected to the Labbuddy photodiode (~ 15GHz BW) and then to the R&S RTO2000 4GHz scope (~ 100ps rise time).
1) I put a mirror just before the CVBG. |
|
"ThomX" CELIA Amplifier commissionning, posted by Ronic Chiche at Optical room about lasers and optics
|
The "ThomX" CELIA amplifier is installed on the optical table.
I added all the rubber pieces available between the 2 racks to isolate as best as possible the top rack, which embeds some fans, from the bottom
rack from which the laser beam is going out to the FP cavity. |
|
"ThomX" CELIA Amplifier commissionning, posted by Ronic Chiche at Optical room about lasers and optics
|
Beam size at the amplifier output:
to make this measurement, I switched ON only 1st and 2nd stage.
the dichroïc mirror seems to work the best in reflection at normal AOI !!! |
|
OEwaves lock and Finesse measurement, posted by Ronic Chiche at Optical room about lasers and optics
|
this morning, I locked the FP cavity with the OEwaves CW laser and the "Fred fiber amplifier" used at 500mA of pump current.
the lock was much more easy than with the Koheras.
I had to change the 10GHz EOM which seems damaged as the modulation depth is very low and does not allow a Finesse measurement by modulation |
|
"ThomX" CELIA Amplifier commissionning, posted by Ronic Chiche at Optical room about lasers and optics
|
this afternoon, with Fabian, we did some measurements on the 3rd stage.
finally we used the Dichroïc mirror at AOI=45°C as first mirror and a Thorlabs BB1-E03 as 2nd mirror to send the
beam to the powermeter. |
|
Amplifier output Beam Profile, posted by Manar Amer at Optical room about lasers and optics
|
In preparation to measure the output beam profile from the amplifier at high power, I have placed two wedge mirrors just before the beam dump to be able
to extract the beam.
One of the wedges was taken from ThomX bunker, also the HR and AR mirrors were taken to plic room in case we might need them |
|
Telescope / amplifier output, posted by Manar Amer at Optical room about lasers and optics
|
The previous Sbox telescope was dismantled and the mechanical components cleaned.
its lenses are still in the mounts, it looks that two of them are spherical and two are cylindrical
2 are -100 mm and 2 are +150 mm, there is also a box containing fused silica lenses that could be used. |
|
Telescope / amplifier output, posted by Manar Amer at Optical room about lasers and optics
|
Beam divergence was measured using a method called "Focal
Length Divergence
Measurement Method" |
|
Amplifier output Beam Profile, posted by Manar Amer at Optical room about lasers and optics
|
Beam divergence after amplifier 4.46 mrad
Manar |
|
Telescope / amplifier output, posted by Manar Amer at Optical room about lasers and optics
|
I placed a periscope to adjust the high of the beam from the amplifier output from ~ 10 cm from the table to ~ 15 cm
a dichroic mirror placed after it to reject the pump laser, all the mirrors on the path to the cavity were replaced with dielectric mirrors BB01-E03
the length of the path from the amplifier output to the cavity coupling mirror ~ 2 meters |
|
Telescope / amplifier output, posted by Manar Amer at Optical room about lasers and optics
|
Here is a view of beam propagation in the optical software : GaussianBeam
the red filled shape is the model of the CELIA amplifier beam propagation with a divergence of 4.46 mrad
(the 2 black dots is the measurement of the beam size without any lens to change the beam propagation). |
|
2 Mirror Setup @ 216.6 MHz, posted by Manar Amer at Optical room about lasers and optics
|
Adding information about the 2 mirror cavity setup (plan - spherical) that is currently installed.
From Aurélien at the start of the manipulation.
@ 0 is where the injection mirror is located |
|
2nd stage CELIA amplifier, posted by Ronic Chiche at Optical room about lasers and optics
|
| today, we measured the 2nd stage CELIA amplifier pump wavelength : 970-990 nm |
|
2nd stage CELIA amplifier, posted by Ronic Chiche at Optical room about lasers and optics
|
today we did several test with the Dichroic shortpass mirror (Thorlabs DMSP1000) and with a 10nm optical filter around 1030nm (which works in tranmission
at AOI=0).
one used the dichroic mirror in reflection: one should cut the pump @970-990nm and we should keep only the signal @1030nm. |
|
Telescope / amplifier output, posted by Manar Amer at Optical room about lasers and optics
|
removing the reading which is not correct (wrong use of software)
redone a reading similar using a lens of focal 250 mm got a FWHM-X = 0.64 mm , FWHM-Y = 0.84 mm
using the vertical to calculate the divergence, we get divergence ~ 2.17 mrad which is closer to fit obtained for the beam profile by taking |
|
Telescope / amplifier output, posted by Manar Amer at Optical room about lasers and optics
|
Note the correct beam divergence is approximately ~ 2.3 mrad
M2 = 1.1 in this fit, but it is not yet optimized !!!!! could be reason for not accurate telescope
reading. |
|
Telescope / amplifier output, posted by Manar Amer at Optical room about lasers and optics
|
Am adjustment on the lenses position to have a smaller waist.
+ 250 mm @ 88 cm from amplifier
-150 mm @ 111 cm from amplifier |