Measurement sample 50mm 5/6 ; effect of the strain on the birefringence

50L, 5/6

average = 15
air r = 3 ; sample r = 13
center x= 323.565; y= 154.375 ; z=60
azy=0
air : Wed, Jul 3, 2024 2-04-01 PM.txt
sample : Wed, Jul 3, 2024 2-06-34 PM.txt

azy =15
air : Wed, Jul 3, 2024 2-51-23 PM.txt
sample : Wed, Jul 3, 2024 2-53-52 PM.txt

azy =30
air : Wed, Jul 3, 2024 3-31-49 PM.txt
sample : Wed, Jul 3, 2024 3-34-19 PM.txt

azy=45
air : Thu, Jul 4, 2024 8-47-25 AM.txt
sample :Thu, Jul 4, 2024 8-58-18 AM.txt

azy =60
air= Thu, Jul 4, 2024 9-38-32 AM.txt
sample=Thu, Jul 4, 2024 9-41-45 AM.txt

azy=75 air= Thu, Jul 4, 2024 10-25-24 AM.txt
sample=Thu, Jul 4, 2024 10-27-51 AM.txt

azy=90
air= Thu, Jul 4, 2024 11-41-35 AM.txt
sample= Thu, Jul 4, 2024 11-44-40 AM.txt

After this measurement we saw that the birefringence of this sample seems follow a very singular pattern. We suppose that this pattern can be induce by the strain of the screws use to fix the sample. So we decide to remove this screw and mad the same measurement with the same sample but without his two screw. The result is on the following measurement.

50L, 5/6 WITHOUT SCREWS STRAIN
average = 15
air r = 3 ; sample r = 13
center x= 323.565; y= 154.375 ; z=60
azy = 90
air: Thu, Jul 4, 2024 1-57-18 PM.txt
sample:Thu, Jul 4, 2024 2-00-03 PM.txt

azy=0 air = Thu, Jul 4, 2024 4-39-39 PM.txt
sample = Thu, Jul 4, 2024 4-42-12 PM.txt

azy=15 air=Thu, Jul 4, 2024 5-37-47 PM.txt
sample=Thu, Jul 4, 2024 5-40-16 PM

azy=30 air= Thu, Jul 4, 2024 6-39-02 PM.txt
sample:Thu, Jul 4, 2024 6-41-54 PM.txt

azy=45 air = Fri, Jul 5, 2024 7-44-42 AM.txt
sample = Fri, Jul 5, 2024 7-48-36 AM.txt

azy=60
air : Fri, Jul 5, 2024 8-25-22 AM.txt
sample :Fri, Jul 5, 2024 8-30-02 AM.txt

azy = 75
air : Fri, Jul 5, 2024 9-07-23 AM.txt
sample : Fri, Jul 5, 2024 9-07-23 AM.txt