Article

Applied Physics B

, Volume 95, Issue 3, pp 559-563

First online:

Hybrid nonlinearity supported by nonconventionally biased photorefractive crystals

  • P. ZhangAffiliated withShaanxi Key Laboratory of Optical Information Technology, School of Science, Northwestern Polytechnical University
  • , S. LiuAffiliated withShaanxi Key Laboratory of Optical Information Technology, School of Science, Northwestern Polytechnical University
  • , C. LouAffiliated withThe Key Laboratory of Weak-Light Nonlinear Photonics, Ministry of Education and TEDA Applied Physics School, Nankai University
  • , Y. GaoAffiliated withShaanxi Key Laboratory of Optical Information Technology, School of Science, Northwestern Polytechnical University
  • , J. ZhaoAffiliated withShaanxi Key Laboratory of Optical Information Technology, School of Science, Northwestern Polytechnical University Email author 
  • , J. XuAffiliated withThe Key Laboratory of Weak-Light Nonlinear Photonics, Ministry of Education and TEDA Applied Physics School, Nankai University
  • , Z. ChenAffiliated withThe Key Laboratory of Weak-Light Nonlinear Photonics, Ministry of Education and TEDA Applied Physics School, Nankai UniversityDepartment of Physics and Astronomy, San Francisco State University

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Abstract

We theoretically and experimentally demonstrate that a nonconventionally biased photorefractive crystal can support hybrid nonlinearity, i.e., coexistence of self-focusing and self-defocusing nonlinearities under an identical bias condition. It is revealed that the nonlinearity experienced by a one-dimensional (stripe) beam can be switched between self-focusing and self-defocusing solely by changing the beam orientation. For a two-dimensional beam, the hybrid nonlinearity leads to unusual nonlinear beam dynamics with enhanced anisotropy and nonlocality.

PACS

42.65.Jx 42.65.Hw 42.65.Tg