Abstract
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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The study is supported by the Russian Science Foundation, Grant #16-19-10619.
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This article is part of the Topical Collection on Focus on Optics and Bio-photonics, Photonica 2017.
Guest Edited by Jelena Radovanovic, Aleksandar Krmpot, Marina Lekic, Trevor Benson, Mauro Pereira, Marian Marciniak.
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Badikov, D.V., Badikov, V.V., Ionin, A.A. et al. Sum-frequency generation of Q-switched CO laser radiation in BaGa2GeSe6 and GaSe nonlinear crystals. Opt Quant Electron 50, 243 (2018). https://doi.org/10.1007/s11082-018-1514-0
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DOI: https://doi.org/10.1007/s11082-018-1514-0