摘要
A 3D nonlinear photonic crystal containing four parallel segments of periodicχ^((2))grating structure is fabricated employing the femtosecond laser poling of ferroelectric Ca_(0.28)Ba_(0.72)Nb_(2)O_(6) crystal.The second harmonic generation from this foursegment structure is studied with a fundamental Gaussian wave.By tuning the wavelength of the fundamental wave,the second harmonic varies from the Laguerre-Gaussian beam(topological charge l_(c)=1)to the higher-order Hermite-Gaussian beam and Laguerre-Gaussian again(l_(c)=−1).This effect is caused by the wavelength-dependent phase delays introduced by the four-grating structure.Our study contributes to a deeper understanding of nonlinear wave interactions in 3D nonlinear photonic crystals.It also offers new possibilities for special beam generation at new frequencies and their control.
作者
Yunze Wang
Yan Sheng
Shan Liu
Ruwei Zhao
Tianxiang Xu
Tiefeng Xu
Feng Chen
Wieslaw Krolikowski
王韵泽;盛艳;刘山;赵如薇;徐天翔;徐铁峰;陈峰;Wieslaw Krolikowski(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;Quantum Science and Technology,Research School of Physics,Australian National University,Canberra,ACT 2601,Australia;Ningbo Institute of Oceanography,Ningbo 315832,China;State Key Laboratory of Crystal Materials and Key Laboratory of Particle Physics and Particle Irradiation of the Ministry of Education,School of Physics,Shandong University,Jinan 250100,China)
基金
supported by the National Natural Science Foundation of China(Nos.12274248,62275136,and 12361141815)
the Natural Science Foundation of Zhejiang Province(No.LY22F050009)
the K.C.Wong Magna Fund of Ningbo University.
