Scientific Reports (Apr 2018)

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
https://doi.org/10.1038/s41598-018-25041-3
Journal volume & issue
Vol. 8, no. 1
pp. 1 – 6

Abstract

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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.