Analysis of Polarization State by Digital Holography with Polarization Modulation |
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Authors: | Masayuki Yokota Yoshitaka Terui Ichirou Yamaguchi |
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Institution: | (1) Department of Electronic Engineering, Faculty of Engineering, Gunma University, Kiryu Gunma, 376-8515, Japan |
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Abstract: | The digital holographic technique is applied to analyze the spatial distribution of polarization state of light transmitted
through anisotropic objects using an orthogonal linearly polarized reference beam. The polarization orientation of reference
beam is switched by an optical fiber Faraday rotator for successive hologram recording. To confirm the principle of polarization
analysis, a quarter wave plate (QWP) is used and the distribution of polarization state over the object surface is analyzed
for various orientations of the QWP. By providing an area of a known polarization for a part of the object wave as a reference,
a phase drift of the reference waves can be evaluated and compensated for using the reference area. The principal axis and
ellipticity of polarization ellipse are calculated and compared with their theoretical values. A good agreement between the
experimental and theoretical values is observed. |
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Keywords: | digital holography polarization Faraday rotator flint glass fiber |
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