New power record in ThomX cavity, posted by Ronic Chiche at ThomX igloo about lasers and optics 
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today, we were able to store more than 94kW in the FP cavity, always with the same parameter : 33% laser amplifier ratio
Ronic
Chiche wrote:
today, we were able to store more than 93kW in the FP cavity, always |
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New power record in ThomX cavity, posted by Ronic Chiche at ThomX igloo about lasers and optics
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today, we were able to store more than 95kW in the FP cavity, always with the same parameter : 33% laser amplifier ratio
Ronic
Chiche wrote:
today, we were able to store more than 94kW in |
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New power record in ThomX cavity, posted by Ronic Chiche at ThomX igloo about lasers and optics
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today, we were able to store more than 97kW in the FP cavity, always with the same parameter : 33% laser amplifier ratio
Ronic
Chiche wrote:
today, we were able to store more than 95kW in the FP cavity, always |
air conditionning in ThomX Bunker, posted by Ronic Chiche at ThomX igloo about lasers and optics
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The temperature slitly increase in thomx Bunker from 23° to 24° during the last day.
The thermalisation of the CFP is very long...
In any case the operation of the CFP is so easy, it seems to be correlated to the weather... tody it's very nice as of hte rest of the week. |
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air conditionning in ThomX Bunker, posted by Ronic Chiche at ThomX igloo about lasers and optics
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after the new temperature setting for the bunker air cooling (winter to summer transition), the temperature drop from 24° to 20°C which induced
a slight misalignment between the onefive oscillator and the fiber injection.
the amplifier photodiode PD_IN which checks the amplifier power injection drop also from 3mW to 2.885mW... hopefully, it is enough to start the |
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air conditionning in ThomX Bunker, posted by Ronic Chiche at ThomX igloo about lasers and optics
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I finally got 93-94kW for 33% amp ratio.
I had to move the FP-cavity length to compensate the temperature change in the bunker.
doing that, I had the message "Low Limit SW pressed" when I tried to move P4z under -98 000 steps !!! |
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New power record in ThomX cavity, posted by Ronic Chiche at ThomX igloo about lasers and optics
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yesterday, we were able to store more than 98kW in the FP cavity, always with the same parameter : 33% laser amplifier ratio
Ronic
Chiche wrote:
today, we were able to store more than 97kW in |
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Recipies for different FPC power, posted by Ronic Chiche at ThomX igloo about lasers and optics
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For ~ 46kW power in the FP-cavity:
Alplhanov amplifier ratio : 20%
Axis 18 position : -0004710 steps |
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Recipies for different FPC power, posted by Ronic Chiche at ThomX igloo about lasers and optics
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For ~ 23kW power in the FP-cavity:
Alplhanov amplifier ratio : 15%
Axis 18 position : -0016014 steps |
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Recipies for different FPC power, posted by Ronic Chiche at ThomX igloo about lasers and optics
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For ~ 66kW power in the FP-cavity:
Alplhanov amplifier ratio : 25% |
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Stability test Without and with , posted by Ronic Chiche at ThomX igloo about lasers and optics
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The laser starts at 93 KW.
This morning I operated the laser locked with the RF for 1h30 without any delock. All the machine was switch off.
All the system was very stable. Sometimes the 20 Hz perturbation was visible but no delocking. |
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Suite tests stabilité, posted by Ronic Chiche at ThomX igloo about lasers and optics
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We continue to find what gives high freq. perturbation.
The laser starts at 92 KW it is stable and locked to the RF. NO high freq parturbation.... With the machine off. (30 min of lock)
We put now the machine ON (All in warming exept pulsed elements)... => the system is very stable NO delock, NO high freq perturbations. The |
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Xrays experiment with prostate, posted by Ronic Chiche at ThomX igloo about lasers and optics
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Today we do XRays for experiment.
The laser start to 33% at 93 KW but Pgain = 0.033
The laser is locked so stable for the moment. We have Xrays and the system is stable. |
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laser operation again with machine OFF, posted by Ronic Chiche at ThomX igloo about lasers and optics
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The laser start at 33% with 92 KW optimized and
P=0.03
I=0.0005 |
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Laser Amplifier used at 70%, posted by Ronic Chiche at ThomX igloo about lasers and optics
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today, I installed a laser dump just before the telescope to avoid any high power (50W instead of 17W usually) issue in the injection line.
last time, we saw some plastic mounts of the polarizers slightly burnt because of some small misalignment.
I used a thorlabs LB2 (see picture) which is able to manage 80W CW or 25J/cm2 pulses => this is OK in both cases : 50W CW / 1.5µJ/pulse |
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Increasing the FP-cavity power , posted by Ronic Chiche at ThomX igloo about lasers and optics 8x
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Last Friday, we tried to increase the FP-cavity power by just increasing the amplifier ratio from 35% to 70%.
It took a bit longer than expected because it started with the surprise of finding our entire setup powered off…
The power had tripped, and the switch that allowed us to remotely reset the power supplies had been damaged. |
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Increasing the FP-cavity power , posted by Ronic Chiche at ThomX igloo about lasers and optics
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today with Alice and Daniele,
we checked the distance of the optical setup :
from the amplifier output (the fiber output) to the 2nd lens (+200 mm) : |
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Increasing the FP-cavity power , posted by Ronic Chiche at ThomX igloo about lasers and optics
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new power increase after alignment of the waveplates and iris.
amplifier ratio (%) => FPC cavity power (kW) => FPC cavity coupling (%) => Vr unlock (mV)
33 => 98 => |
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Increasing the FP-cavity power , posted by Ronic Chiche at ThomX igloo about lasers and optics
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I installed a stronger optical filter on the reflection photodiode and loaded it on 1kOhms.
70% amplifier ratio => 575 mV => 575 µA => no more photodiode linearity issue
amplifier ratio (%) => Vr unlocked (mV) |
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Increasing the FP-cavity power , posted by Ronic Chiche at ThomX igloo about lasers and optics
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this morning with Daniele, we set the amplifier ratio to 33% => 97kW
then, we set the amplifier ratio to 50% => 124 kW (position of the diffuser on Axis 18 : +11775)
we changed the waveplates axis => no effect |