Alphanov amplifier beam profile measurement, posted by Ronic Chiche at ThomX igloo about lasers and optics | software
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Yesterday, Guillaume Machinet and Vincent Clet from Alphanov came to fixe some issues with the laser amplifier:
- 1) they fixed the "rep. rate" measurement issue.
previously, the voltage range in which it was possible to detect the correct rep rate (33MHz) was very narrow ~ 50mV. |
Alphanov amplifier beam profile measurement, posted by Ronic Chiche at ThomX igloo about lasers and optics | software 
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This morning with Victor we took a reading of the beam profile using a 400 mm lens at 70 % and 100 % amplification.
Will process the data and add after
Note : after an hour and half of amplifier on at 70% we increased the power to 100%, and after ~ 10 minutes the amplifier turned off and showed |
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Alphanov amplifier beam profile measurement, posted by Ronic Chiche at ThomX igloo about lasers and optics | software
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this morning with Manar,
we checked the Alphanov amplifier issue : "The laser has been stopped because its power is too far from the nominal power".
the photodiode voltage measuring the output power has drifted again and then, the estimated output power was wrong, triggering an alarm issue. |
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Alphanov amplifier beam profile measurement, posted by Ronic Chiche at ThomX igloo about lasers and optics | software
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We took reading of the beam profile of the amplifier without a lens @ 30 cm from the 2nd wedge for amplification percentages
20-30-40-50-60-70-80-90-100 % another additional 3 readings will be taken at different locations for all amplification percentages.
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Alphanov amplifier beam profile measurement, posted by Ronic Chiche at ThomX igloo about lasers and optics | software
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due to several "case temperature" issues, I change the "Max case temperature" in the "general config" of the "Alphanov
Software" from 50°C to 55°C.
=> validated by Alphanov. |
Alphanov amplifier beam profile Data , posted by Manar Amer at ThomX igloo about lasers and optics | detectors and electronics 8x
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Adding the schematic of the measurements.,
the 4° Beam Deviation, AR Coating ( B coating)
The 3 data points taken of the beam profile are fitted in Gaussian Beam with taking the beam waist at the output of the compressor box. |
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Alphanov amplifier beam profile Data , posted by Manar Amer at ThomX igloo about lasers and optics | detectors and electronics
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This Morning with Victor the amplifier was turned on @ 20% amplification (output ~ 9 W ) for approximately 3 hours and no error appeared.
I took data of the beam profile at different points without a lens after the 2 wedges
@ 0% (only pump beam), output ~ 300 mW (taken from previous data) , output after 2 wedges 2.2 uW |
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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 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 |
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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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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 |