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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 16 — Aug. 12, 2013
  • pp: 18671–18679

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

Wenjie Wang, Yan Sheng, Vito Roppo, Zhihui Chen, Xiaoying Niu, and Wieslaw Krolikowski  »View Author Affiliations

Optics Express, Vol. 21, Issue 16, pp. 18671-18679 (2013)

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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.

© 2013 OSA

OCIS Codes
(190.2620) Nonlinear optics : Harmonic generation and mixing
(190.7220) Nonlinear optics : Upconversion
(190.4223) Nonlinear optics : Nonlinear wave mixing

ToC Category:
Nonlinear Optics

Original Manuscript: May 1, 2013
Revised Manuscript: June 27, 2013
Manuscript Accepted: July 8, 2013
Published: July 30, 2013

Wenjie Wang, Yan Sheng, Vito Roppo, Zhihui Chen, Xiaoying Niu, and Wieslaw Krolikowski, "Enhancement of nonlinear Raman-Nath diffraction in two-dimensional optical superlattice," Opt. Express 21, 18671-18679 (2013)

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