Abstract

An optical system for conversion of mid-infrared laser radiation into terahertz radiation is proposed. The proposed system uses lasing with a wavelength of 2 μm in a holmium:yttrium–aluminum–garnet (Ho:YAG) laser in the first stage of the system, conversion of the Ho:YAG laser radiation in two parametric light sources based on ZnGeP2 single-crystals with fixed and tunable wavelengths in the range of 3–4.5 μm in the second stage, and conversion of the radiation of these two parametric sources in the 3–4.5-μm region into the terahertz range by generating difference-frequency radiation in the nonlinear ZnGeP2 optical crystal in the third stage. We estimate the characteristics of the output terahertz radiation.

© 2018 Optical Society of America

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