Second-harmonic generation in periodic fork-shapedx(2) gratings at oblique incidence

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外文摘要：Three-dimensional[3D]nonlinear photonic crystals have received intensive interest as an ideal platform to study nonlinear wave interactions and explore their applications.Periodic fork-shaped gratings are extremely important in this context because they are capable of generating second-harmonic vortex beams from a fundamental Gaussian wave,which has versatile applications in optical trapping and materials engineering.However,previous studies mainly focused on the nor-mal incidence of the fundamental Gaussian beam,resulting in symmetric emissions of the second-harmonic vortices.Here we present an experimental study on second-harmonic vortex generation in periodic fork-shaped gratings at oblique inci-dence,in comparison with the case of normal incidence.More quasi-phase-matching resonant wavelengths have been observed at oblique incidence,and the second-harmonic emissions become asymmetric against the incident beam.These results agree well with theoretic explanations.The oblique incidence of the fundamental wave is also used for the generation of second-harmonic Bessel beams with uniform azimuthal intensity distributions.Our study is important for a deeper understanding of nonlinear interactions in a 3D periodic medium.It also paves the way toward achieving high-quality structured beams at new frequencies,which is important for manipulation of the orbital angular momentum of light.

外文关键词：

second-harmonic generationnonlinear photonic crystalperiodically poled ferroelectric crystalquasi-phase matchingnonlinear wavefront shaping

作者：

盛艳、刘山、胡效康、陈鑫、徐天翔、赵如薇、Wieslaw Krolikowski

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作者单位：

Laboratory of Infrared Materials and Devices,Research Institute of Advanced Technologies,Ningbo University,Ningbo 315211,China

Engineering Research Center for Advanced Infrared Photoelectric Materials and Devices of Zhejiang Province,Ningbo University,Ningbo 315211,China

Department of Quantum Science and Technology,Research School of Physics,Australian National University,Canberra,ACT 2601,Australia

School of Physics and Optoelectronics Engineering,Xidian University,Xi'an 710071,China

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基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNatural Science Foundation of Zhejiang ProvinceAustralian Research CouncilK.C.Wong Magna Fund of Ningbo University

项目编号：

12274248622751366190512461905125LY22F050009

出版年：

2024

DOI：

10.3788/COL202422.041902

中国光学快报(英文版)

中国光学学会中国科学院上海光学精密机械研究所

中国光学快报(英文版)

CSTPCD

影响因子：1.305

ISSN：1671-7694

年,卷(期)：2024.22(4)