What is Photoelastic modulator?Is it necessary to use Photoelastic modulator or retarder wave plates in set up of Magneto optic kerr effect(MOKE)?

26 November 2021 0 3K Report

In Magneto optic kerr effect(MOKE),polarised light passes through PEM first before incident on the sample or sometimes PEM is used at place ahead of sample and similar case is with the retardation plates.If these are not in the set up of MOKE,what would be the impact .Basically What is the role ,PEM and retarder wave plates participates in MOKE?

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