Enhancement of nonlinear Raman-Nath diffraction in two-dimensional optical superlattice | Zendy

Wenjie Wang | Zendy; Yan Sheng | Zendy; V. Roppo | Zendy; Zhihui Chen | Zendy; Xiaoying Niu | Zendy; Wiesław Królikowski | Zendy

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Enhancement of nonlinear Raman-Nath diffraction in two-dimensional optical superlattice

Author(s) -

Wenjie Wang,

Yan Sheng,

V. Roppo,

Zhihui Chen,

Xiaoying Niu,

Wiesław Królikowski

Publication year - 2013

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.21.018671

Subject(s) - optics , diffraction , randomness , physics , raman spectroscopy , modulation (music) , nonlinear optics , phase modulation , nonlinear system , self phase modulation , superlattice , raman scattering , materials science , optoelectronics , mathematics , laser , quantum mechanics , phase noise , statistics , acoustics

We study second harmonic generation via nonlinear Raman-Nath diffraction in an optical superlattice that maintains a periodic modulation of the second-order nonlinear coefficient χ((2)) in transverse direction but undergoes random modulation in longitudinal direction. We show that the random χ((2)) modulation offers a continuous set of reciprocal lattice vectors to compensate for the phase mismatch of nonlinear Raman-Nath diffraction in the longitudinal direction, leading to more efficient harmonic generation for a wide range of wavelengths. We also characterize the intensity dependence of nonlinear Raman-Nath diffraction on the degree of randomness of the optical supperlattice.

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