摘要

We use the nonlinear coupled-mode theory to theoretically investigate Second-harmonic generation (SHG) in subwavelength x-cut and z-cut lithium niobate (LN) thin-film waveguide and derive the analytical formula to calculate SHG efficiency in x-cut and z-cut LN thin-film waveguide explicitly. Under the scheme of optimal modal phase matching (MPM), two types of LN thin-film can achieve highly efficient frequency doubling of 1064nm laser with a comparable conversion efficiency due to very consistent modal field distribution of the fundamental wave and second harmonic wave and efficient overlap between them. Such a robust MPM for high-efficiency SHG in both subwavelength x-cut and z-cut LN thin-film waveguides are further confirmed in a broad wavelength range, which might facilitate design and application of micro-nano nonlinear optical devices based on subwavelength LN thin-film

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引用该论文

Peng Lingzhi,Hong Lihong,Chen Baoqin,He Peng,Li Zhiyuan. Robust modal phase matching in subwavelength x-cut and z-cut lithium niobate thin-film waveguide[J].Chinese Optics Letters,2021,19(7):07.