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29 April 1996 Special case of nonlinearity of biological crystals
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Proceedings Volume 2795, Nonlinear Optics of Liquid and Photorefractive Crystals; (1996) https://doi.org/10.1117/12.239224
Event: Nonlinear Optics of Liquid and Photorefractive Crystals, 1995, Ai-Danil, Crimea, Ukraine
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.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Galina I. Dovbeshko, Leonid I. Berezhinsky, and Vyacheslav V. Obukhovsky "Special case of nonlinearity of biological crystals", Proc. SPIE 2795, Nonlinear Optics of Liquid and Photorefractive Crystals, (29 April 1996); https://doi.org/10.1117/12.239224
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