Sum-frequency generation of Q-switched CO laser radiation in BaGa2GeSe6 and GaSe nonlinear crystals

被引：0
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作者：
Dmitriy V. Badikov
Valeriy V. Badikov
Andrey A. Ionin
Igor O. Kinyaevskiy
Yury M. Klimachev
Andrey A. Kotkov
Konstantin V. Mitin
Daria V. Mokrousova
Vera A. Mojaeva
机构：
[1] P.N. Lebedev Physical Institute of Russian Academy of Science,
[2] Kuban State University,undefined
[3] Shvabe—Research,undefined
[4] Moscow State University of Geodesy and Cartography,undefined
来源：
Optical and Quantum Electronics | 2018年 / 50卷
关键词：
Sum-frequency generation; Multiline CO laser; Nonlinear crystals; Nonlinear coefficient;
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摘要：
Sum-frequency generation of multiline Q-switched CO laser radiation is studied in the BaGa2GeSe6 (BGGSe) crystal and in the GaSe crystal. The maximal external conversion efficiency obtained in the BGGSe crystal is 0.7%, which corresponded to the internal conversion efficiency of 1% taking into account optical losses under reflection from uncoated facets of the crystal. The maximum external conversion efficiency in the GaSe crystal is 0.15% with internal efficiency 0.31%. Effective nonlinearity of BGGSe crystal is determined through the ratio between measured efficiency in BGGSe and GaSe crystals. Effective nonlinearity for sum-frequency generation of the CO laser emission in the BGGSe crystal is deff = 42 ± 14 pm/V, and nonlinear coefficient of this crystal is d11 = 49 ± 15 pm/V.
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