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Optical superlattice optimization structure setting method aiming at coupling nonlinear optical course

An optical superlattice and nonlinear optics technology, applied in nonlinear optics, optics, instruments, etc., can solve the problems of not considering the inter-harmonic coupling effect, not the optimal structure of the coupled nonlinear process, etc.

Inactive Publication Date: 2010-11-17
NANJING UNIV
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Problems solved by technology

However, this method does not consider the coupling effect between harmonics, and is actually far from the optimal structure for coupled nonlinear processes

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  • Optical superlattice optimization structure setting method aiming at coupling nonlinear optical course
  • Optical superlattice optimization structure setting method aiming at coupling nonlinear optical course
  • Optical superlattice optimization structure setting method aiming at coupling nonlinear optical course

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Embodiment Construction

[0036] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0037] To sum up, the main idea of ​​conventional optical superlattice structure setting is to provide one or more inverse lattice vectors to compensate the wave vector mismatch in the nonlinear process, and to make the Fourier coefficient corresponding to the inverse lattice vectors as large as possible. But for the coupled parametric process, due to the coupling between the harmonics, there is no simple correspondence between the harmonic conversion efficiency and the overall inverse lattice Fourier coefficient of the superlattice structure. For example, for the coupled triple frequency process, when the inverse lattice vectors are spatially non-uniformly distributed, the overall nonlinear conversion efficiency of the third harmonic is not simply proportional to the product of the effective nonlinear coefficients of the two sub-process...

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Abstract

The invention relates to a method for setting an optical superlattice structure aiming at a coupling nonlinear optical process. Fourier transformation of a window is adopted to replace common whole fourier transformation; a local effective nonlinear coefficient and a spatial weighting function of a reciprocal lattice vector of an optical superlattice are introduced; the competitive relation between the fourier coefficients of each reciprocal lattice vector is considered; the spatial weighting function of the reciprocal lattice vector is subjected to optimized matching; for a triple-frequency coupling process, the spatial weighting function of the reciprocal lattice vector leans to the reciprocal lattice vector of the frequency doubling process in the initial stage and leans to the reciprocal lattice vector of the sum frequency process in the late stage; and through the optimization of the spatial distribution of the local fourier coefficients of two reciprocal lattice vectors, the method realizes the optimization of nonlinear conversion efficiency in the coupling process and carries out the setting of the optical superlattice structure on the basis.

Description

technical field [0001] The invention belongs to the cross field of nonlinear optics and superlattice material technology, and particularly relates to a novel optical superlattice structure setting method for cascade coupling nonlinear optics process. Compared with conventional methods, this method can greatly improve the conversion efficiency of coupled nonlinear optical processes. Background technique [0002] Light is an electromagnetic wave. Under normal circumstances, the propagation of light satisfies the principle of linear superposition, and the two beams of light can penetrate each other without hindrance without any interaction with each other. But when the light intensity reaches a certain level and there is a nonlinear medium involved, it will be possible to produce nonlinear optical effects. At this time, the principle of linear superposition is no longer satisfied, and the frequency of light will change. Since the 1960s, with the birth of laser light sources,...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/35
Inventor 张超秦亦强朱永元
Owner NANJING UNIV
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