Why a rough-surface scattering incident polarized laser light can be perceived as the depolarizing system

Vladimir Ya. Mendeleev; Sergey N. Skovorod'ko

doi:10.1117/12.454662

5 February 2002 Why a rough-surface scattering incident polarized laser light can be perceived as the depolarizing system

Vladimir Ya. Mendeleev, Sergey N. Skovorod'ko

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Proceedings Volume 4680, Second International Conference on Lasers for Measurement and Information Transfer; (2002) https://doi.org/10.1117/12.454662
Event: Second International Conference on Lasers for Measurement and Information Transfer, 2001, St. Petersburg, Russian Federation

Abstract

The degree of depolarization of laser light scattered from an isotropic rough silicon surface and a unidirectional rough steel surface was measured with a polarometer in the specular direction for angles of incidence from 30 degree(s) to 80 degree(s). Rms roughness of the surfaces was greater than laser light wavelength and less than correlation length of the roughness. For the laser light linearly polarized at a 45 degree(s) angle to the plane of incidence, dependence of the measured degree of depolarization on angle of incidence has one maximum and angle of incidence corresponding to the maxima is close to the pseudo-Brewster angle for a smooth surface for both the silicon and the steel. It is found experimentally that the reason for the measured depolarization is spatial variations of the azimuth and the ellipticity of the fully polarized scattered light within a polarometer aperture. Computer simulation of the scattering from a one-dimensional rough steel surface satisfactorily describing the dependence of the measured degree of depolarization on angle of incidence for the unidirectional rough steel surface for angles of incidence up to 70 degree(s) inclusive shows the single scattering makes the main contribution to the dependence of the measured degree of depolarization on angle of incidence.

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Vladimir Ya. Mendeleev and Sergey N. Skovorod'ko "Why a rough-surface scattering incident polarized laser light can be perceived as the depolarizing system", Proc. SPIE 4680, Second International Conference on Lasers for Measurement and Information Transfer, (5 February 2002); https://doi.org/10.1117/12.454662

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