Enhancement of UV Second-Harmonic Radiation at Nonlinear Interfaces with Discontinuous Second-order Susceptibilities

Xiaohui Zhao; Yuanlin Zheng; Ning An; Huaijin Ren; Xuewei Deng; Xianfeng Chen

doi:10.1038/s41598-018-25041-3

Enhancement of UV Second-Harmonic Radiation at Nonlinear Interfaces with Discontinuous Second-order Susceptibilities

Sci Rep. 2018 Apr 27;8(1):6695. doi: 10.1038/s41598-018-25041-3.

Authors

Xiaohui Zhao^{1

2

3}, Yuanlin Zheng^{1

2}, Ning An^{2

3}, Huaijin Ren⁴, Xuewei Deng⁵, Xianfeng Chen^{6

7}

Affiliations

¹ School of Physics and Astronomy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, China.
² Collaborative Innovation Center of IFSA (CICIFSA), Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, China.
³ Shanghai Institute of Laser Plasma, Shanghai, 201800, China.
⁴ Institute of Applied Electronics, China Academy of Engineering Physics, Mianyang, Sichuan, 621900, China.
⁵ Laser Fusion Research Center, China Academy of Engineering Physics, Mianyang, Sichuan, 621900, China.
⁶ School of Physics and Astronomy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, China. xfchen@sjtu.edu.cn.
⁷ Collaborative Innovation Center of IFSA (CICIFSA), Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, China. xfchen@sjtu.edu.cn.

Abstract

We investigate the generation of ultraviolet (UV) second-harmonic radiation at the boundary of a UV transparent crystal, which is derived from the automatic partial phase matching of the incident wave and the total internal reflection. By adhering to another UV non-transparent crystal with a larger second-order nonlinear coefficient χ⁽²⁾, a nonlinear interface with large disparity in χ⁽²⁾ is formed and the enhancement of UV second-harmonic radiation is observed experimentally. The intensity of enhanced second harmonic wave generated at the nonlinear interface is up to 11.6 times that at the crystal boundary. As a tunable phase-matching method, it may suggest potential applications in the UV, and even vacuum-UV region.