Birefringence mitigation (LC)
ShalikaSingh - 19:04, Wednesday 15 November 2023 (3349)
BS cal uncertainty
As mentioned in elog 3345, our BS is mounted on a magnetic mount. Therefore to calibrate both faces, I had rotated the mount. Hence, to check the stability of mount and the uncertainty in our calibration due to this rotation, I calibrated both front and back face 3 additional times. The camera was moved everytime I was measuring reflection or transmission. Hence, there can be few discrepancies from camera position. (the camera was only unscrewed and relocated without changing its mount)
 
As a result, the parameters mentioned in the table show that the magnetic mount is quite stable and doesn't affect(a lot) calibration of either the front or back face.  In all the following cases, the beam was always along same path. Additionally, the average order in labview was 10 during data acquisition.
 

 

Front Face

Back Face

Parameters

Position 1 (3345)

   Position 2         

Position 3

Position 4        

Position 1 (3345)

Postition 2         

Position 3             

Position 4

Reflection (%)

56.5 ± 1.1

56.6 ± 1.7

56.5 ± 1.3

52.8 ± 1.4

47.7 ± 0.8

49.5 ± 1.7

52.6 ± 0.9

49.1 ± 1.3

Transmission (%) 

40.8 ± 0.7

40.8 ± 1.5

40.8 ± 0.8              

40.9 ± 1.7

40.7 ± 0.7

40.9 ± 1.1

40.8 ± 0.7

40.9 ± 1.3

Loss (%)

2.7 ±  1.7

2.7 ± 2.8

2.7 ± 1.9

6.2 ± 2.6

 11.6 ± 1.5

9.6 ± 2.5

6.6 ± 1.6

9.9 ± 2.3

Input Azimuth  (°)

 -0.014+/-0.009

-0.0190 ± 0.0017

-0.0316 ± 0.0017

0.0207 ± 0.0021

1.6018 ± 0.0023

0.0190 ± 0.0017

-0.0316 ± 0.0017

0.0207 ± 0.0021

Reflected Azimuth  (°)

1.4154 ±  0.0022

1.3606 ± 0.0019

1.1625 ± 0.0022

1.5322 ± 0.0023

-0.014+/-0.009

1.4733 ± 0.0017

1.2267 ± 0.0017

1.7301 ± 0.0020

Transmitted Azimuth  (°)

-0.060 ±  0.0027

-0.0654 ± 0.0028

-0.0775 ± 0.0017

-0.0226 ± 0.0017

-0.0939 ± 0.0020

-0.1036 ± 0.0018

-0.0658 ± 0.0021

-0.0360 ± 0.0019

Input Ellipticity  (°)

0.008+/-0.008

0.0178 ± 0.0013

0.0150 ± 0.0013

0.0133 ± 0.0019

0.008+/-0.008

0.0178 ± 0.0013

0.0150 ± 0.0013

0.0133 ± 0.0019

Reflected Azimuth Ellipticity(°)

-0.3969 ± -0.3969

-0.3626 ± 0.0015

-0.3650 ± 0.0025

-0.1964 ± 0.0019

 -0.1469 ± 0.0026

-0.1577 ± 0.0017

-0.0142 ± 0.0018

-0.0392 ± 0.0020

Transmitted ellipticity  (°)

0.2928 ±  0.0028

0.2921 ± 0.0033

0.2977 ± 0.0032

0.3175 ± 0.0016

-0.0549 ± 0.0021

-0.0623 ± 0.0014

-0.0602 ± 0.0014

-0.0555 ± 0.0017

 

P.S

1. Front face = where laser is incident on BS in an ideal configuration, and back face means the face opposite to front face.




	2. the folders are saved on pc with the corresponding position name as folder name in BS calibration.