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  • Received: Nov. 4, 2020

    Accepted: Dec. 19, 2020

    Posted: Mar. 30, 2021

    Published Online: Apr. 2, 2021

    The Author Email: Peng He (hfirst@163.com), Zhiyuan Li (phzyli@scut.edu.cn)

    DOI: 10.3788/COL202119.071902

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    Lingzhi Peng, Lihong Hong, Baoqin Chen, Peng He, Zhiyuan Li. Robust modal phase matching in subwavelength x-cut and z-cut lithium niobate thin-film waveguides[J]. Chinese Optics Letters, 2021, 19(7): 071902

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Chinese Optics Letters, Vol. 19, Issue 7, 071902 (2021)

Robust modal phase matching in subwavelength x-cut and z-cut lithium niobate thin-film waveguides

Lingzhi Peng1, Lihong Hong1, Baoqin Chen1, Peng He2,3,**, and Zhiyuan Li1,*

Author Affiliations

  • 1School of Physics and Optoelectronics, South China University of Technology, Guangzhou 510641, China
  • 2Guangdong Full-Spectra Laser Technology Co., Ltd., Dongguan 523808, China
  • 3Dongguan Sanhang Innovation Research Institute, Dongguan 523808, China

Abstract

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

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