Neolase amplifier installation, posted by Ronic Chiche at Optical room about mechanics | lasers and optics | cabling
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now, I installed the long pipes (2x 3m) in closed loop (without the amplifier connected), but the exact ones used to connect the laser, with the same
pipe adapters.
after the compression process, the chiller works at 0.9 bar and the measured flow is 4.7Lpm. |
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Neolase amplifier installation, posted by Ronic Chiche at Optical room about mechanics | lasers and optics | cabling
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I cut a small part of the black pipe on the amplifier side (could it be slightly deformed by a try with an other type of adapter ?), with the dedicated
tool, changed the adapter and plugged it more firmly in the pipe (pipe deeply inserted in the adapter).
it seems, there is no more leakage. |
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Neolase amplifier installation, posted by Ronic Chiche at Optical room about mechanics | lasers and optics | cabling
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as soon as I connect the amplifier to the pipes, the flow decreases to 1.7Lpm.
and the filling process is very long and noisy, as there was something blocking the filling process... |
Motors for D-shaped mirrors, posted by Loïc Amoudry at Optical room about mechanics | lasers and optics 
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Motors have been installed on 16/10/18. No problem with them.
Effect of the motors tested on 17/10/18. No improvement. But they give the possibility to perfectly cut HOM or let them go through as show
the following picture of a 2.2 mode at ~340 mW in trans and 70% coupling @4A. |
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Power measurement with D-shape, posted by Loïc Amoudry at Optical room about mechanics | lasers and optics
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Measurements of lot of points with D-shape mirrors well positionned.
Power not optimized to the best but almost. (@4A could have 350 mW).
I (A)
Ptrans (mW)
Coupling |
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Alignment of a 2-mirror FP cavity, posted by Ronic Chiche at Optical room about mechanics | lasers and optics
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today with Alice,
- we measured the height of the SBOX windows center : 140mm from the optical table.
- we set the laser fiber colimator exactly at this height. |
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2-mirror cavity alignment, posted by Alice Renaux at Optical room about mechanics | lasers and optics
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At the beginning of the week, I installed a half-wave plate, a beamsplitter cube and a quarter-wave plate, as well as the end-of-cavity mirror, which
I unsuccessfully tried to align.
I removed the end-of-cavity mirror and started the laser injection over again with the two motorized mirrors placed in front of the vacuum chamber |
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SBox Finesse at 216.6625 MHz, posted by Manar Amer at Optical room about lasers and optics | vacuum
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The Sbox currently has the injection from ThomX installed T ~ 120 ppm , M2 planar from Sbox spare and M3 / M4 spherical mirrors from Sbox installed.
The last finesse measurement that was done gave a Finesse of ~ 19300 (After cleaning M2 using ethanol + aceton + pure water)
on Friday the whole optical table was cleaned again and the inside of the box was cleaned (even with a lot of dust inside the box the Finesse |
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SBox Finesse at 216.6625 MHz, posted by Manar Amer at Optical room about lasers and optics | vacuum
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Max Finesse obtained @ 4 mirror setup was ~ 19 300
With M1 from ThomX , M2/M3/M4 from SBox
Manar |
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SBox Finesse at 216.6625 MHz, posted by Manar Amer at Optical room about lasers and optics | vacuum
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Manar
Amer wrote:
Max Finesse obtained @ 4 mirror setup was ~ 19 300 |
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Spincoater - Mirrror cleaning , posted by Manar Amer at Optical room about lasers and optics | utilities
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Used the spincoater and pure water to clean dielectric mirrors which will be installed inside the SBox for directing the reflection line.
The method : place pure alchole on mirror - wipe it using white sterile tissue (in one direction) - clean with pure water in spincoater suing
cotton swap . |
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Spincoater - Mirrror cleaning , posted by Manar Amer at Optical room about lasers and optics | utilities
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Images of the SBox mirrors cleaned at the same time when the cavity was aligned.
Directly from the spincoater to the SBox directly.
PowerPoint attached shows details |
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Spincoater - Mirrror cleaning , posted by Manar Amer at Optical room about lasers and optics | utilities
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PowerPoint shows the detailed images of all the mirrors before and after cleaning.
Images of SBox mirrors and M1 from Gamma factory attached only for the front after cleaning
the lines showing are on the back of the mirrors, they come from the spinning mount the mirrors are fixed on in the spin-coater. |
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Spincoater - Mirrror cleaning , posted by Manar Amer at Optical room about lasers and optics | utilities
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Following the observation that when rotating M2 plan mirror of SBox the deformation position of the mode changes.
M2 was replaced with M2 spare of SBox
images of the mirror front side attached before and after cleaning, no spots at the center, but there seems to be 2 spots far from the center |
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Spincoater - Mirrror cleaning , posted by Manar Amer at Optical room about lasers and optics | utilities
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While repeating the alignment, the mirrors were cleaned using the spin-coater and placed again.
The current mirrors placed in the SBox are
M1 plane injection from Gamma factory |
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100W CELIA laser amplifier "how's to" document, posted by Ronic Chiche at Optical room about lasers and optics | software
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1st version of the document.
if some information is not correct or missing, give any comment by replying to this post. |
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Cavity Lock , posted by Manar Amer at Optical room about lasers and optics | detectors and electronics | software
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Start with the cavity lock images attached, taken from last week, at start we have a coupling ~ 5% and started improving on the
alignment .
The image of 00 modes attached corresponds to the coupling seen on the oscilloscope. |
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Cavity Lock , posted by Manar Amer at Optical room about lasers and optics | detectors and electronics | software
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Current setup at SBox for locking the cavity
After spacial matching, the coupling increased to ~ 15 - 20 %
The locking was done for the fundamental mode, tried to improve the coupling with the motors, but the lock is very unstable to be investigated. |
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Cavity Lock , posted by Manar Amer at Optical room about lasers and optics | detectors and electronics | software
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Cavity locked today under vacuum and no airflow, it is stable over a long time
the alignment was improved and an increase of the transmission by 20 % from its original value
unfortunately, data from the oscilloscope was saved, but it was not in the correct format (image) to show. |
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Cavity Lock , posted by Manar Amer at Optical room about lasers and optics | detectors and electronics | software
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Closing the series for the setup
The cavity was only locked @ 133.33 MHz but the Finesse was not measured
The FSR was changed to match the new laser MENHIR 216.6625 MHz |