Abstract

An optical circuit is designed for the ring cavity of an optical parametric oscillator (OPO) based on two series-mounted active elements—mercury thiogallate crystals (HgGa₂S₄) with the radiation tunable in the near- and mid-IR ranges (4.75–9.07 μm). The dependences of the radiation idler wavelength on the phase-matching angle and of the distribution of the IR OPO output radiation intensity on the idler wavelength are derived. The possibility of narrowing the spectral width of the output radiation by introducing a dispersing element (Fabry–Perot etalon) into the cavity is considered.

中文翻译：

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在 4.75-9.07-μm 波长范围内可调的 HGS 光学参量振荡器

摘要

为光学参量振荡器 (OPO) 的环形腔设计了一种光路，该光路基于两个串联安装的有源元件 - 硫代镓酸汞晶体 (HgGa ₂ S ₄ )，其辐射可在近红外和中红外范围 (4.75 –9.07 微米）。导出了辐射闲散波长对相位匹配角的依赖性以及红外 OPO 输出辐射强度分布对闲散波长的依赖性。考虑了通过将色散元件（法布里-珀罗标准具）引入腔体来缩小输出辐射光谱宽度的可能性。