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Optimization on the frequency conversion of LiGaS2 crystal Y. Q. Dong, Y. Yin, J. J. Huang [et al.]

Contributor(s): Yin, Yi | Huang, Jin Jer | Zhang, Xin Lu | Andreev, Yury M, 1946- | Ezhov, Dmitry M | Grechin, Sergey G | Dong, Yue QiuMaterial type: ArticleArticleSubject(s): оптимальное фазовое согласование | генерация второй гармоники | преобразование частоты | кристаллыGenre/Form: статьи в журналах Online resources: Click here to access online In: Laser physics Vol. 29, № 9. P. 095403 (1-7)Abstract: Based on newly improved optical parameters of the excellent biaxial crystal LiGaS2, its phase-matching upon second harmonic generation and general parametric processes are investigated. In particular, the issue of optimal phase-matching is solved by a computation on figure-of-merit (FM). It is found that the effective fundamental wavelength of second harmonic generation entirely covers the 3–5 µm atmosphere window and mid-IR signals of 2–12 µm can be generated by suitable parametric processes. Analysis of the FM and dispersion verifies a quite effective type II parametric process: from a pump in the range of 0.8–1.0 µm to an ultrashort pulse generation at 6–12 µm and also suggests a type I pump at 1.7–1.9 µm for 3–5 µm pulse generation. The computation definitely renders an optimal phase-matching in the XY principal plane for type II configuration, or in a special direction for type I case, far away from the commonly used XZ principal plane.
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Based on newly improved optical parameters of the excellent biaxial crystal LiGaS2, its phase-matching upon second harmonic generation and general parametric processes are investigated. In particular, the issue of optimal phase-matching is solved by a computation on figure-of-merit (FM). It is found that the effective fundamental wavelength of second harmonic generation entirely covers the 3–5 µm atmosphere window and mid-IR signals of 2–12 µm can be generated by suitable parametric processes. Analysis of the FM and dispersion verifies a quite effective type II parametric process: from a pump in the range of 0.8–1.0 µm to an ultrashort pulse generation at 6–12 µm and also suggests a type I pump at 1.7–1.9 µm for 3–5 µm pulse generation. The computation definitely renders an optimal phase-matching in the XY principal plane for type II configuration, or in a special direction for type I case, far away from the commonly used XZ principal plane.

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