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Entry   Laser and FP cavities frequency adjustment, posted by Ronic Chiche at ThomX igloo about mechanics | lasers and optics 
    Reply   Laser and FP cavities frequency adjustment, posted by Ronic Chiche at ThomX igloo about mechanics | lasers and optics 
Message ID: 330     Entry time: Mon Mar 4 18:32:21 2024     In reply to: 329
 Author: Ronic Chiche 
 Status: Fixed 
 Type: info 
 Category: mechanics | lasers and optics 
 Location: ThomX igloo 
 Title: Laser and FP cavities frequency adjustment 

This afternoon, I did the 2nd half of the travel: dF @ 33MHz = 0Hz
=> the Smaract motor position is now at +1750µm
=> the FP cavity motor Mot.03 position stayed at -200 000 steps
=> the FP cavity motor Mot.06 position is now at -790 000 steps
the PDin photodiode was at 3.191mW @ 33% amplifier ratio
the PDpulse photodiode was at 33.372 / 33.371MHz

the FP-cavity power is ~47kW @ 33% amplifier ratio => to be improved

there is no signal beating at 500MHz, only at 33MHz => to be investiguated => fixed

Ronic Chiche wrote:

at the beginning of the procedure, the frequency gap between the new Ring 33MHz frequency (33.3378MHz) and the laser/FP cavities frequency was 12.33kHz
=> the Smaract motor position was at +100µm
=> the FP cavity motor Mot.03 position was at -358 720 steps
the PDin photodiode was at 3.151mW @ 33% amplifier ratio
the PDpulse photodiode was at 33.384MHz

after several moves (each time, one corrects the CEP / alignment to keep ~ 47kW inside the FP-cavity)
we can move the laser cavity at 300nm/s without any laser modelock loss
we move the FP cavity at the same speed (300nm/s = 50 steps/s with 1step  = 6nm)

now, we did roughly half of the travel : dF @ 33MHz = 5.3kHz
=> the Smaract motor position was at +1075µm
=> the FP cavity motor Mot.03 position was at -200 000 steps
the PDin photodiode was at 3.178mW @ 33% amplifier ratio
the PDpulse photodiode was at 33.377MHz

 

 

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