Alphanov amplifier Beam Profile, posted by Manar Amer at ThomX igloo about lasers and optics 8x
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Today: Manar, Ronic and Aurlien started the study of the beam profile of the alphanov amplifier at high power.
The setup shown in the image shows how the power is reduced by using Anti-reflective mirrors,
pick up 1 : Anti-reflective coating on both sides , pick up 2 : Anti-reflective coating on one side and High |
Alphanov amplifier Beam Profile, posted by Manar Amer at ThomX igloo about lasers and optics
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Manar
Amer wrote:
Today: Manar, Ronic and Aurlien started the study of the beam profile |
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Alphanov amplifier Beam Profile, posted by Manar Amer at ThomX igloo about lasers and optics 6x
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Adding the fitted beam in 1D in Horizontal and vertical axis.
for 10% to 60%
Manar |
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Alphanov amplifier Beam Profile, posted by Manar Amer at ThomX igloo about lasers and optics
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Today a second reading of the beam profile was done , with Victor ,Ronic, Aurlien and Manar
an additional set-up was made using two 4 deg wedges instead of High reflecting (HR) and Anti-reflecting (AR) mirrors.
Two reading were taken: |
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Alphanov amplifier Beam Profile, posted by Manar Amer at ThomX igloo about lasers and optics 9x
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Readings of the beam shape and horizontal (upper plot) and vertical (lower plot) axis fit at the direct output of the amplifier.
The beam shape relatively shaped like an egg.
Manar |
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Alphanov amplifier Beam Profile, posted by Manar Amer at ThomX igloo about lasers and optics
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Readings of the beam shape and fit at the output of the compressor
differance from previous reading is that here we used wedges instead of HR mirrors.
Similar to previous readings, the beam shape deforms and the Gaussian fit is bad after 50% amplification |
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Alphanov amplifier Beam Profile, posted by Manar Amer at ThomX igloo about lasers and optics 6x
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Adding the readings 20% , 30% , 40% for output of amplifier after the compressor
Manar |
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Alphanov amplifier Beam Profile, posted by Manar Amer at ThomX igloo about lasers and optics 12x
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This Morning, another reading was taken for the output of the amplifier after the compressor using 2 wedge mirrors.
In addition, a start of the calibration of a PulseCheck "Autocorrelator" to measure the pulse duration.
note, the pulsed laser used is OneFive 133.33 MHz |
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First hands on the Alphanov amplifier & software, posted by Ronic Chiche at ThomX igloo about lasers and optics
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Software Works well and is operational.
Just closing the log series!!!
Ronic |
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Alphanov amplifier Beam Pulse Duration, posted by Manar Amer at ThomX igloo about lasers and optics
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The pulse duration from the amplifier compressor output will be measured using PulseCheck autocorelator
a first alignment of the device was done, continuation in the afternoon.
YouTube link attached of the general operation of pulse check < 5 min : https://www.youtube.com/watch?v=J1pNHYySSYg |
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Alphanov amplifier Beam Pulse Duration, posted by Manar Amer at ThomX igloo about lasers and optics
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Measurement of the pulse was done at the end of the afternoon, Pulse Duration FWHM = 12.9 ps
After a long process of adjusting the alignment and angle of the crystal inside the device
The power input on the PulseCheck device should be above the sensitivity, in our case we had 1 mW input. |
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Alphanov amplifier Beam Pulse Duration, posted by Manar Amer at ThomX igloo about lasers and optics
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Pulse Duration FWHM = 12.9 ps
Manar
Amer wrote:
Measurement of the pulse was done at the end of the afternoon, Pulse |
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Alphanov amplifier Beam Profile, posted by Manar Amer at ThomX igloo about lasers and optics 20x
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Victor, Ronic, Manar
Today was dedicated to the study of the CVBG, and it's effect on the beam profile
we opened the box containing the 2 CVBGs : The 2CVBG are glued from the bottom on a copper surface . |
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Alphanov amplifier Beam Profile, posted by Manar Amer at ThomX igloo about lasers and optics 8x
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For better comparison ,
the measurements done previously with 2 CVBGs was done at ~ 30 cm and the one done on Friday was for 1 CVBG is at 1 m
so we did additional measurement for 2 CVBGs at 1 m, for 20 , 50 and 70 % amplification |
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Alphanov amplifier compressor's CVBG thermal images, posted by Ronic Chiche at ThomX igloo about lasers and optics
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last Friday with Manar, we took some thermal images of the Alpnavov compressor box.
I post a small document to summarize some points :
- the 2 mirrors used to make the CVBG injection are polarized thin-film mirrors... thus sensitive to the beam polarization. |
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Alphanov amplifier compressor's CVBG thermal images, posted by Ronic Chiche at ThomX igloo about lasers and optics
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last Friday with Manar, we took some thermal images of the Alpnavov compressor box.
I post a small document to summarize some points :
- the 2 mirrors used to make the CVBG injection are polarized thin-film mirrors... thus sensitive to the beam polarization. |
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Vessels vacuum at ambiant pressure, posted by Ronic Chiche at ThomX igloo about vacuum
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Last Friday and this morning, with Bruno, we close the ring/cavity valves and put some dry air in the two vessels through a filter to avoid turbulences.
Now, the two vessels are at ambient pressure and ready for opening (to remove the mirrors).
One can let the ambient pressure in the vessels as long as we want, the ring/cavity valves have been chosen to be compatible with the high vacuum |
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mirrors removing, posted by Ronic Chiche at ThomX igloo about lasers and optics
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This morning with Viktor, we opened the 2 vessels and removed the 4 FP-cavity mirrors.
all the mirrors have been put in plastic boxes with labels to indicate which mirror it is,
and with all the HR coatings face down. |
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33MHz laser SN2439 back to Orsay, posted by Ronic Chiche at Optical room about lasers and optics
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On the 8th of July, the SN2439 33MHz laser was returned from NKT to our lab, being repaired.
it stayed all the weekend to warm up in the optical room and has been turned on on Monday.
the mode-locking was not working (28mW output power and a CW line for the optical spectrum), thus I "kicked" the laser with 100µm |
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Amplifier output power , posted by Loïc Amoudry at Optical room about lasers and optics
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We checked the Dichroic mirror we have : it is a DMSP1000 shortpass dichroic mirror as specified in this post.
The Arrow engraved on the edge of the mirror points on the AR surface !
not on the HR surface... |