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A promising nonlinear conjugate-gradient method proposed to design nonlinear domains with a disordered distribution

Center for Theoretical Physics, Department of Physics, Capital Normal University, Beijing 100048, China

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Department of Materials Engineering, The University of British Columbia, 309-6350 Stores Road, Vancouver, BC, V6T 1Z4, Canada

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Yun-Song Zhou

Center for Theoretical Physics, Department of Physics, Capital Normal University, Beijing 100048, China

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, and

Fu-He Wang

Center for Theoretical Physics, Department of Physics, Capital Normal University, Beijing 100048, China

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https://doi.org/10.1142/S021798491550030XCited by:0 (Source: Crossref)

Abstract

A new method, namely the nonlinear conjugate-gradient (NCG) method, is proposed to design nonlinear domains with a disordered distribution, in which an efficient broadband second harmonic generation can be achieved simultaneously with high conversion efficiency. It is demonstrated by numerical simulation that the NCG method has obvious advantages in realizing the optimal quasi-phase-matching, in comparison with the traditional simulated annealing method.

Keywords:

PACS: 42.65.Ky, 42.65.An

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