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KAGRA MIR (Polarization)
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MarcEisenmann - 11:03, Monday 11 October 2021 (2704)Get code to link to this report
Polarization angle as a function of input polarization

In order to further investigate the effects of the input beam incident angle we mesured the polarization angle as a function of the input beam polarization angle.

Data are attached to this entry.

Note that :

There are input polarization angle for which the s polarization power transmitted with sample is higher than transmitted s polarization power without sample..

The minimum s polarization seems to be reached for hwp  angle = 71 deg (ie 26 +45 deg) and using this polarization to normalize our signals means that the hwp angle = 341 deg that was assumed to be fully s polarization is in fact 10 deg polarization angle...

Images attached to this report
2704_20211011040330_polacheck.png
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Comments related to this report
MarcEisenmann - 13:16, Thursday 14 October 2021 (2710)

Just to clarify :

There is some input polarization angle for which the the s polarization power is higher with sample than the maximum without sample.

This hints for either scattered light but more probably some misalignment (maybe the beam hits the side of the PDs that fakes strong power?)