“Two-Color” Difference Frequency Generation Due to Type-I and Type-II Phase Matching in a Nonlinear BaGa2GeS6 Crystal Pumped by Femtosecond Ti:Sapphire Laser Pulses
I. O. Kinyaevskiy, M. V. Ionin, A. V. Koribut, Ya. V. Grudtsyn, Yu. M. Klimachev, D. V. Badikov
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Abstract
The difference frequency generation of femtosecond Ti:sapphire laser pulses in the wavelength range of 5‒10 μm in a 2.46-mm-long nonlinear BaGa2GeS6 crystal has been experimentally studied. The energy of difference frequency radiation pulses has reached 23 μJ. It has been found that “two-color” difference frequency generation occurs in BaGa2GeS6 simultaneously due to type-I and type-II phase matching, leading to the appearance of two ~0.5 μm wide spectral bands in the mid-infrared range separated by 1.5–2 μm. The influence of the polar and azimuthal angles of BaGa2GeS6 on the spectral and energy characteristics of the two-color radiation has been demonstrated. The resulting two-color radiation can be used for remote gas analysis by the differential absorption method.
期刊介绍：
All topics of experimental and theoretical physics including gravitation, field theory, elementary particles and nuclei, plasma, nonlinear phenomena, condensed matter, superconductivity, superfluidity, lasers, and surfaces.
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