A real-time method to measure full field retardation near quarter wavelength is proposed.
The circularly polarized beam passes through a sample with a large aperture. The measuring beam then
goes through a quarter-wave plate and is then split by a Wollaston prism. An image with two
sub-images is then detected by a high-speed image sensor. The full field retardation near quarter
wavelength can be obtained in real time by processing the image. The measured retardation is
independent of the fast axis angle of the sample and the fluctuation of the initial intensity. In
experiments, a wedge waveplate is measured with different fast axis angle and initial intensity, and
the full field retardations are acquired. The maximum and standard deviation of the full field
retardation is 1.5° and 0.4°. The
validity of the method is verified.
© 2012 Optical Society of Korea
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