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Proceedings Paper

Special case of nonlinearity of biological crystals
Author(s): Galina I. Dovbeshko; Leonid I. Berezhinsky; Vyacheslav V. Obukhovsky
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Paper Abstract

In aminoacid crystals ((alpha) -glycine, (beta) -alanine, L-histidine) a gigantic growth of nonlinearity at simultaneous action of two resonance fields (Omega) m and (omega) $i) (double resonance conditions) was found. If frequency (omega) i responds to one of the infrared (IR) transitions (600 - 2000 cm-1) and (Omega) m is in resonance with the absorption lines which are in extremely high frequency (EHF) range ((Omega) m approximately equals 37.5 - 53.5 GHz), the value of third order nonlinear polarization coefficient (chi) (3)((Omega) m, - (Omega) m, (omega) i) amounts to 10 cm/erg. Despite small EHF radiation power (Pm less than 10 mW) such nonlinearity may result in essential (up to 10%) change of reflection coefficient R((omega) i). A change of the orientation and form of reflection coefficient polarization indicatrix for resonance field in IR range was also observed. The most pronounced nonlinear effects appear at resonance frequencies connected with deformational vibrations of NH3+ group and valent vibrations of COO- group.

Paper Details

Date Published: 29 April 1996
PDF: 7 pages
Proc. SPIE 2795, Nonlinear Optics of Liquid and Photorefractive Crystals, (29 April 1996); doi: 10.1117/12.239224
Show Author Affiliations
Galina I. Dovbeshko, Institute of Physics (Ukraine)
Leonid I. Berezhinsky, Institute of Physics (Ukraine)
Vyacheslav V. Obukhovsky, Kiev Tarasa Shevchenko Univ. (Ukraine)

Published in SPIE Proceedings Vol. 2795:
Nonlinear Optics of Liquid and Photorefractive Crystals
Gertruda V. Klimusheva; Andrey G. Iljin, Editor(s)

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