CW FP Cavit lock , posted by Manar Amer at ThomX igloo about lasers and optics | detectors and electronics 
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Yesterday morning we locked the cavity on a strange mode in the cavity (we call it mode, but not sure what it is ??)
we also managed to lock on a higher order mode 02
we get an estimated 30% coupling (expected value), and note that we have not installed a telescope yet. |
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CW FP Cavit lock , posted by Manar Amer at ThomX igloo about lasers and optics | detectors and electronics
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This morning with Daniele and Viktor,
- we confirmed the "potato" mode was well centered on the injected beam and was not due to some misalignment of the injected beam compared
to the cavity axis. |
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FP Finesse measurement using CW, posted by Manar Amer at ThomX igloo about lasers and optics | detectors and electronics
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This morning, with Ronic and Daniele, we locked the cavity again (The lock was relatively easy and stable during the reading of the finesse)
We took 2 reading of finesse
1st : @ 33.2808 MHz (what the cavity length was at) : Finesse = |
PW laser Injection into cavity , posted by Manar Amer at ThomX igloo about lasers and optics | detectors and electronics
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Yesterday,
we installed the second high power reflecting mirrors at the output of the amplifier.
We aligned and installed a telescope
that has adjustable distance between the 2 lenses of -100 mm, and + 200 mm, with approximate diameter at the injection window of ~ 4.5 mm.
Amplifier |
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PW laser Injection into cavity , posted by Manar Amer at ThomX igloo about lasers and optics | detectors and electronics
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On Monday with Daniele,
we did full characterization of amplifier beam @ 10% amplification, adjusted the telescope accordingly
and injected into the cavity aligned and improved on the fundamental mode.
On Tuesday with Daniele and Kevin
I
added a low pass filter between 1 - 1.9 MHz on the reflected signal, to reject the oscillator signal (33.33 MHz)
removed the external resistors |
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PW laser Injection into cavity , posted by Manar Amer at ThomX igloo about lasers and optics | detectors and electronics
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Added Note: the coupling we get is at low power, only preamplifier is on (~ 300 mW)
was done at the end due to excitation of higher order modes.
Wanted to improve the fundamental first, then increase the power. |
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PW laser Injection into cavity , posted by Manar Amer at ThomX igloo about lasers and optics | detectors and electronics
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Today with Ronic and Daniele we attempted to lock the cavity, but the alphanov amplifier did not turn on because of an error in MMD3 (related to the
third stage)
the new error is having the MMD3 error show on the alarm window of the LAL software, and having the Alarms on the line 3 of the alphanov software |
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Cavity Lock - Alphanov Amplifier , posted by Manar Amer at ThomX igloo about lasers and optics | detectors and electronics | cabling | software
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This morning, while trying Guillaume solution of disconnecting the 24 V necessary to the second and third stage and raise the threshold of Temp preamp
1 (to only operate the ampli with first stage only)
Ronic disconnected the 24 volt connection, turned on amplifier LAL software but no MMD3 error or a big temp on Temp preamp 1 , software worked |
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Cavity Lock - Alphanov Amplifier , posted by Manar Amer at ThomX igloo about lasers and optics | detectors and electronics | cabling | software 13x
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Yesterday, with Ronic we locked ThomX cavity on the second resonance
Laser : 33.36 MHz , Amplifier : 0 % (worked with no errors all day)
adding image for the lock on the second resonance (locked), 00 Mode image, fit, Beam measurements |
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Cavity Lock - Alphanov Amplifier , posted by Manar Amer at ThomX igloo about lasers and optics | detectors and electronics | cabling | software
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Today, I installed a power meter at the transmission point of the 1st spherical mirror , transmission 3 ppm (direct from cavity window beam profiler,
no filter)
We locked the cavity at 2 different resonances of the fundamental mode, the lock in both cases was stable for a round 1 minute. |
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Cavity Lock - Alphanov Amplifier , posted by Manar Amer at ThomX igloo about lasers and optics | detectors and electronics | cabling | software
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Today with Ronic,
starting with major events that happened (Water circulation + ThomX valves )
Early in the morning a company worked on the water network, it seemed it was not restarted properly so there was no water circulation |
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Cavity Lock - Alphanov Amplifier , posted by Manar Amer at ThomX igloo about lasers and optics | detectors and electronics | cabling | software
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In the morning, we locked on the first resonance. With an increase on the amplifier power @ 20-25% and 30%, which reduced the noise
we manage to get a coupling when improving the CEP up to 55 - 60 % coupling : put there is still a drift on the CEP
The controller for the oscillator frep and CEP produces a lot of noise, even if it is disconnected. we need to switch it off to remove its effect |
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Cavity Lock - Alphanov Amplifier , posted by Manar Amer at ThomX igloo about lasers and optics | detectors and electronics | cabling | software
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The computer is possible to connect from the control room,
we are able to run remotely the amplifier, cavity motors, oscillator motors, lase lock (note: there is an issue with the keyboard, we are not
able to use it with remote access!!!!!!!!) |
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Onefive Origami 33MHz specs, posted by Loïc Amoudry at Optical room about lasers and optics 6x
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Power during ~20h, power after turn on, spectrum image and excel datas, polarisation and pulse length.
Powermeter measurments were done with a /10 filter.. 3 mW means 30 mW
Important: Onefive does not automatically locks after being turned on. |
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End of vacuum test and cavity ready for cleaning, posted by Loïc Amoudry at Optical room about vacuum
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Vacuum tests finished on 19 december 2018.
Spent last two days to discuss the importance of removing aluminium and baking wires before to insert mirrors for cleanliness issues. Finally
we took pictures to support our demand. |
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Cleaning outside IP cavity, posted by Loïc Amoudry at Optical room about lasers and optics | utilities
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From 7th january to 11th january.
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End of cleaning, plastic fixed on cavity, posted by Loïc Amoudry at Optical room about utilities
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| 08/02/19 - End of the cleaning process. |
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Mirrors checked with binocular microscope, posted by Loïc Amoudry at Optical room about lasers and optics
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29/01/19 - ThomX mirrors have also been checked with binocular microscope. They shown the same spots as S-BOX mirrors.
1st image shows reflective face of a spherical mirror.
2nd image shows reflective face of M1 (sapphire). |
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Mirrors sent to LMA, posted by Loïc Amoudry at Other about lasers and optics
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30/01/19 - As LMA people came, we discussed about the spots on ThomX mirrors which should be clean. As mentionned in "SBOX commissioning",
these spots are normal.
An other question appeared during the conversation about the storage time and location of these mirrors. They have been stored for more than |
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Basic alignment & alignment motors check, posted by Loïc Amoudry at Optical room about mechanics | lasers and optics
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14/02/19: The 4 motors but Mby control works. Mby motor home does not bring it to its "middle" position but to the end of its range.
Issue circumvented using the higher rights software.
The beam is now going through the cavity windows (from P1 to S2). |