Photodeflection spectroscopy of the flowing gyrotropic media

Georgiy S. Mityurich; P. V. Astakhov

doi:10.1117/12.131935

25 November 1992 Photodeflection spectroscopy of the flowing gyrotropic media

Georgiy S. Mityurich, P. V. Astakhov

Proceedings Volume 1844, Acousto-Optics and Applications; (1992) https://doi.org/10.1117/12.131935
Event: Acousto-Optics and Applications, 1992, Gdansk-Jurata, Poland

Abstract

A method is developed for photodeflection spectroscopy of flowing gyrotropic media, having circular dichroism bands. Particular cases of collinear and transversal geometry of excitating and probing beam interaction are discussed. Probe beam deflection angles are defined, and their magnitudes are analyzed depending on modulation frequency (Omega) , interaction time t, elipticity of excilating beam, velocity of sample translation movement V_(chi ), as well as a value of reduced coordinate (chi) /(alpha) (where (alpha) is a Gause beam radius). It is shown, that there is no influence of gyrotropic effects on the angular dependence magnitude in the case of interaction collinear geometry. Application of right- and left-circular polarized excitated radiation in the case of transversal geometry of interaction leads to the appearance of two deflection angles (phi) _+/- of the probe beam. The deflection angles difference (Delta) (phi) equals (phi) ₊ -(phi) _- may reach quite measurable values (10^-3 - 10^-4 radn) and depends on movement velocity V_chi, modulation frequency (Omega) , heating time of gyrotropic sample t, and on the circular dichroism parameter (gamma) " equals Im(gamma) . A method of defining of an image part of gyration complex parameter (gamma) " on the basis of the spectroscopy photodeflection method is presented.

Citation Download Citation

Georgiy S. Mityurich and P. V. Astakhov "Photodeflection spectroscopy of the flowing gyrotropic media", Proc. SPIE 1844, Acousto-Optics and Applications, (25 November 1992); https://doi.org/10.1117/12.131935

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