The present work introduces the concept of a total-internal-reflection (TIR)-based optical rotation, quasi-phase-matching (QPM) technique for generating highly efficient second-harmonic optical output in a rectangular slab of magnesium oxide-doped lithium niobate crystal coated with a thin layer of yttrium oxide. Combinational effects of TIR optical rotation QPM and fractional QPM techniques are experienced at certain bounce points inside the slab, thereby enhancing the conversion efficiency. In this analysis, the thin-film is used for controlling the phase-shifts accompanying the propagation of p- and s-polarized light at the slab-film interface during TIR. A conversion efficiency of 32%, corresponding to a second-harmonic wavelength of 532 nm has been observed using computer-aided simulation. Optical losses such as surface roughness, absorption, and interference effect due to the nonlinear law of reflection have also been incorporated.

中文翻译：

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使用基于全内反射的旋光准相位匹配技术在电光手性材料中高效产生二次谐波

本工作介绍了基于全内反射 (TIR) 的旋光、准相位匹配 (QPM) 技术的概念，用于在掺杂氧化镁的铌酸锂矩形板中产生高效的二次谐波光输出晶体涂有一层薄薄的氧化钇。TIR 旋光 QPM 和分数 QPM 技术的组合效应在板坯内部的某些反弹点处得到体验，从而提高了转换效率。在该分析中，薄膜用于控制 TIR 期间伴随 p 和 s 偏振光在平板薄膜界面传播的相移。使用计算机辅助模拟观察到的转换效率为 32%，对应于 532 nm 的二次谐波波长。光学损耗，例如表面粗糙度、吸收、