The refractive indices and the absorption coefficients of β-BBO, LBO, and KTP nonlinear optical crystals have been measured in the wavelength range of 0.5–3 mm at temperatures of 298 and 78 K. The absorption coefficients of all crystals at a wavelength of 1 mm do not exceed 3.5 cm–1 and fall with cooling. The anisotropy of the absorption coefficients of crystals increases significantly with decreasing wavelength (<1 mm), while at wavelengths >2 mm, it almost disappears. Upon cooling, the absolute values of the absorption coefficients fall below 0.2 cm–1. Based on the measured refractive indices, the collinear phase-matching curves are simulated numerically. The theoretical feasibility of IR (1.064 μm) laser radiation conversion into the millimeter-wave range is demonstrated.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 6, pp. 113–116, June, 2020.
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Nikolaev, N.A., Lansky, G.V., Andreev, Y.M. et al. β-BBO, LBO, AND KTP Nonlinear Crystals as Sources of Millimeter-Wave Radiation. Russ Phys J 63, 1025–1029 (2020). https://doi.org/10.1007/s11182-020-02132-1
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DOI: https://doi.org/10.1007/s11182-020-02132-1