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 |
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 |
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 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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Amplifier Beam Profile over time , posted by Manar Amer at ThomX igloo about lasers and optics | detectors and electronics
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This morning, with Ronic, we opened the compressor box to observe if there is any misalignment of the mounts or the CVBG's
a comparison slide between the Beam Profile over time and measurements we have taken, is included.
we noticed
today that the images need a rotation, and I took the assumption we did not rotate last year and did the rotation of the previous images.
Comparing |
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Amplifier Beam Profile over time , posted by Manar Amer at ThomX igloo about lasers and optics | detectors and electronics 10x
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This morning we took data of the beam profile at 4 different points to see the evolution of
the beam shape
divergence
over distance for all amplification percentages
Data plotted for the distance vs radius for all and divergence in rad is extracted and plotted as a variation of amplification power. |
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Amplifier Beam Profile over time , posted by Manar Amer at ThomX igloo about lasers and optics | detectors and electronics
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Information about today's work is added to logBook !!
Manar
Amer wrote:
This morning we took data of the beam profile at 4 different points |
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New Mirrors from LMA _ Images, posted by Manar Amer at Optical room about lasers and optics
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Today we tested a mirror from one patch
image is for the front face of the mirror
PowerPoint has more details about the images |
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Cavity Alighnment , posted by Manar Amer at ThomX igloo about lasers and optics | detectors and electronics 9x
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Last week, with Ronic and Victor we aligned the cavity using CW laser (Koheras)
we have also installed 4 mirrors in the cavity with the best theoretical qualities (serial number and images included)
The
Plan ULE mirror P4 thickness was not compatible with the piezoelectric mount. We had to install a metal spacer behind the mirror |
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Cavity Alighnment , posted by Manar Amer at ThomX igloo about lasers and optics | vacuum | detectors and electronics
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Today, we prepared lenses for a telescope for the CW laser injection into the cavity, yet to be installed
Image of the transmission at P4 attached, an estimation of the beam size of the mode see is ~ 5.5 mm
The vacuum in the 2 optical cavities is decreasing but slowly. today it is 2.6 - 2.4 * 10^-7 mbar |