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Sum-frequency optical parametric generation
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DOI：10.1016/j.optlaseng.2025.109324.png)
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Abstract
En 中文
Optical parametric processes are popular methods for obtaining tunable laser sources. From a physical viewpoint, their fundamental mechanism is optical difference frequency. This paper reports a novel nonlinear optical phenomenon, sum-frequency optical parametric generation (SFOPG), which originates from self-phase modulation and phase-matched optical sum-frequency. Using commercial ultrafast laser with fixed wavelength as the pump source, we directly obtained broadband tunable, efficient, short wavelength laser with only one nonlinear optical (NLO) crystal. For a KH2PO4 crystal pumped by an 800 nm, 35 fs laser, the shortest output wavelength extended to 285 nm, and the highest optical conversion efficiency reached 22.1 %. For a KH2PO4 crystal pumped by a 1030 nm, 160 fs laser, the output wavelength covered 280–688 nm, covering almost the entire visible band and extending to the deep ultraviolet (UV). As far as we know, SFOPG is the most direct and convenient method to obtain continuously tunable femtosecond laser in visible and UV wavebands, and can be applied by all phase matched NLO materials. Compared with existing OPA systems at visible and UV band, SFOPG exhibits the advantages of one-step conversion, high efficiency, and deep UV extending potential, which will be an important, promising NLO frequency conversion technology for various applications.
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