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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 coupling effect between harmonics, not the optimal structure of coupling nonlinear process, etc.

Inactive Publication Date: 2009-07-08
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

Method used

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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 further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0037] In a nutshell, the main idea of ​​conventional optical superlattice structures is to provide one or more reciprocal lattice vectors to compensate for the wavevector mismatch in nonlinear processes, and to make the Fourier coefficients corresponding to the reciprocal 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 reciprocal vector Fourier coefficient of the superlattice structure. For example, for a coupled triple frequency process, when the reciprocal lattice space is 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-processes....

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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 intersection field of nonlinear optics and superlattice material technology, and specifically relates to a novel optical superlattice structure setting method for cascade coupling nonlinear optical 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 two beams of light can penetrate each other without hindrance without any effect on each other. However, when the light intensity reaches a certain level and nonlinear media participate, nonlinear optical effects may occur. 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, various nonlinear optical e...

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Application Information

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IPC IPC(8): G02F1/35
Inventor 张超秦亦强朱永元
Owner NANJING UNIV
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