有偏压光伏光折变晶体中艾里高斯光束的传输特性  

Propagation Properties of Airy-Gaussian Beams in a Biased Photovoltaic- photorefractive Crystal

作　　者：张拓 陈卫军[1] 母一宁[1] 刘春阳[1] 彭鋆祺 ZHANG Tuo;CHEN Wei-jun;MU Yi-ning;LIU Chun-yang;PENG Jun-qi(School of Science,Changchun University of Science and Technology,Changchun 130022,China)

机构地区：[1]长春理工大学理学院

出　　处：《光子学报》2019年第10期29-37,共9页Acta Photonica Sinica

基　　金：国家自然科学基金(Nos.51602028,61905026);长春理工大学青年科学基金(No.XQNJJ-2017-04)~~

摘　　要：采用分步傅里叶法,数值模拟研究了有偏压光伏光折变晶体中艾里高斯光束的传输特性.结果表明,当艾里高斯光束初始振幅和晶体的外加电场在一定范围内时,可以形成沿直线稳定传输的呼吸式孤子.调节初始振幅或外加电场可以控制孤子的峰值强度和呼吸周期.随着入射光场分布因子的变大,孤子的平均峰值强度先增大后减小,孤子的呼吸周期先变小后变大.随着光束衰减因子的增加,孤子的平均峰值强度先增大后减小,然后再增大.此外,光束入射角为负值时,孤子向左偏移,光束入射角为正值时,孤子向右偏移.入射角只改变孤子的输出位置,不影响孤子的强度、宽度和呼吸周期.Propagation properties of Airy-Gaussian beams in a biased photovoltaic-photorefractive crystal are numerically investigated by using split-step Fourier method.The results show that breathing solitons that propagate stablely along a straight line can be generated when the initial amplitude of the input Airy-Gaussian beams and the external bias field of the crystal are in certain ranges.The peak intensity and the breathing period of the soliton can be controlled by adjusting the initial amplitude and the external bias field.With the increase of the initial light field distribution factor,the mean peak intensity of the soliton firstly increases and then decreases,whereas the breathing period firstly decreases and then increases.With the increase of the beam decay coefficient,the mean peak intensity of the soliton firstly increases,then decreases,and increases again.In addition,the propagation direction of the soliton can tilt to the left with a negative launch angle and to the right with a positive launch angle.The launch angle only affects the output position of the soliton and has no influence on the intensity,width and breathing period of the soliton.

关 键 词：非线性光学 孤子 分步傅里叶法 光折变晶体 艾里高斯光束 

分 类 号：O437[机械工程—光学工程]