M. V. Ionin, A. A. Ionin, I. O. Kinyaevsky, Yu. M. Klimachev, A. V. Koribut, A. M. Sagitova, E. P. Fedorova, D. V. Badikov, G. K. Safaraliev, “A study of effective nonlinearity of BaGa2GeS6 crystal by CO laser sum-frequency generation with type-I and type-II phase matching”, Kvantovaya Elektronika, 2024, Volume 54, Number 8,Pages 461

Lasers

A study of effective nonlinearity of BaGa₂GeS₆ crystal by CO laser sum-frequency generation with type-I and type-II phase matching

M. V. Ionin^a, A. A. Ionin^a, I. O. Kinyaevsky^a, Yu. M. Klimachev^a, A. V. Koribut^a, A. M. Sagitova^a, E. P. Fedorova^a, D. V. Badikov^b, G. K. Safaraliev^c

^a P. N. Lebedev Physical Institute, Russian Academy of Sciences, Moscow, Russia
^b Kuban State University, Krasnodar, Russia
^c Peoples' Friendship University of Russia named after Patrice Lumumba, Moscow, Russia

Abstract: The sum-frequency generation of broadband CO laser radiation (λ ≈ 5 – 6 μm) in a new nonlinear BaGa₂GeS₆ crystal at type I and II phase matching at the variation of polar and azimuth angles of this crystal has been experimentally investigated. A small mismatch (∼ 3°) between the values of measured and calculated phase matching angles was found. Also, based on experimental data and their comparison with calculations, a set of coefficients was determined of the nonlinear susceptibility tensor of BaGa₂GeS₆, which best describes the experimental results.

Keywords: BaGa₂GeS₆, second harmonic generation, sum-frequency generation, СО laser.

Received: 02.08.2024