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- W2153020003 abstract "In aminoacid crystals ((alpha) -glycine, (beta) -alanine, L-histidine) a gigantic growth of nonlinearity at simultaneous action of two resonance fields (Omega) <SUB>m</SUB> and (omega) $i) (double resonance conditions) was found. If frequency (omega) <SUB>i</SUB> responds to one of the infrared (IR) transitions (600 - 2000 cm<SUP>-1</SUP>) and (Omega) <SUB>m</SUB> is in resonance with the absorption lines which are in extremely high frequency (EHF) range ((Omega) <SUB>m</SUB> approximately equals 37.5 - 53.5 GHz), the value of third order nonlinear polarization coefficient (chi) <SUP>(3</SUP>)((Omega) <SUB>m</SUB>, - (Omega) <SUB>m</SUB>, (omega) <SUB>i</SUB>) 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) <SUB>i</SUB>). 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 NH<SUB>3</SUB><SUP>+</SUP> group and valent vibrations of COO<SUP>-</SUP> group." @default.
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- W2153020003 date "1996-04-29" @default.
- W2153020003 modified "2023-09-27" @default.
- W2153020003 title "<title>Special case of nonlinearity of biological crystals</title>" @default.
- W2153020003 doi "https://doi.org/10.1117/12.239224" @default.
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