Broadband cascading of second-order nonlinearity in randomized nonlinear photonic crystal
Date
2012
Authors
Sheng, Yan
Ma, Dongli
Ren, Mingliang
Chen, Baoqin
Roppo, V
Li, Zhiyuan
Koynov, Kaloian
Krolikowski, Wieslaw
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Institute of Physics Publishing
Abstract
We study both experimentally and theoretically optical parametric process in one-dimensional nonlinear photonic crystal with random variation to the sign of the second-order nonlinear coefficient. We demonstrate that the structure randomness enables broadband third-harmonic generation via cascading of two second-order nonlinear parametric wave interactions with the overall conversion efficiency higher than previously recorded in fully disordered media such as the as-grown strontium barium niobate crystal. Furthermore, thanks to the one-dimensional modulation of the second-order nonlinearity, the emitted broadband harmonics preserve well the spatial intensity profile of the incident fundamental light beam, a feature critical for applications of optical frequency conversion but unavailable in two-dimensional fully random media due to the beam divergence caused by the simultaneous emission of noncollinear harmonic.
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Keywords
Keywords: As-grown; Beam divergence; Disordered media; Light beam; Noncollinear; Nonlinear coefficient; Nonlinear photonic crystals; One-dimensional modulation; One-dimensional nonlinear photonic crystals; Optical parametric process; Overall conversion efficiency;
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Source
Journal of Physics D: Applied Physics
Type
Journal article
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2037-12-31
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