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Message ID: 5     Entry time: Tue Oct 9 10:15:17 2018
 Author: Loïc Amoudry 
 Status: Fixed 
 Type: report 
 Category: lasers and optics 
 Location: Optical room 
 Title: Polarization optimization 

Optimization of the polarization has been made the 03/10/18. Checked in reflection of the cavity in reflection&transmission of a PBS, locked and unlocked. Only with 2nd stage.

Ratio values are reflection of PBS divided by transmission or the opposite.

  Unlock value Ratio min/max Lock value Ratio min/max
No optimization        
Reflection 1.21 X 3.89 X
Transmission 14.3 8.5 % 3.1 80 %
Only Lambda/2        
Reflection 4.4 X 2.91 X
Transmission 11 40 % 2.79 96 %
2xLambda/2 + 1Lambda/4        
Reflection 8.3 X 3.4 X
Transmission 6.8 82 % 2.2 65 %
Same + PID optimization        
Reflection 9 X 3.35 X
Transmission 5.76 64 %  2 60 %

 

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