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

• Published in: Optical and quantum electronics 2018-06, Vol.50 (6), p.1-9, Article 243
• Main Authors: Badikov, Dmitriy V., Badikov, Valeriy V., Ionin, Andrey A., Kinyaevskiy, Igor O., Klimachev, Yury M., Kotkov, Andrey A., Mitin, Konstantin V., Mokrousova, Daria V., Mojaeva, Vera A.
• Format: Article
• Language: English
• Subjects: Characterization and Evaluation of Materials; Computer Communication Networks; Crystals; Efficiency; Electrical Engineering; Focus on Optics and Bio-photonics; Internal conversion; Lasers; Nonlinearity; Optical Devices; Optics; Photonica 2017; Photonics; Physics; Physics and Astronomy; Q switched lasers
• ISSN: 0306-8919; 1572-817X
• DOI: 10.1007/s11082-018-1514-0

Sum-frequency generation of multiline Q-switched CO laser radiation is studied in the BaGa 2 GeSe 6 (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 d eff  = 42 ± 14 pm/V, and nonlinear coefficient of this crystal is d 11  = 49 ± 15 pm/V.