反射z扫描方法测量碲化铋晶体的非线性折射率  

Measurement of nonlinear refractive index of bulk bismuth telluride based on reflection z-scan

作　　者：冯栋[1] 曾贤贵[1] 

机构地区：[1]湖南大学物理与微电子科学学院微纳光电器件及应用教育部重点实验室,长沙410082

出　　处：《激光技术》2016年第3期326-330,共5页Laser Technology

基　　金：教育部博士点基金资助项目(20120161120027)

摘　　要：为了研究3维拓扑绝缘体碲化铋(Bi_2Te_3)的非线性光学特性,采用反射z扫描方法,实验测量了800nm飞秒脉冲激光的非线性折射系数。通过理论计算与实验数据拟合获得碲化铋晶体的非线性折射率达到10-14m2/W数量级,为石英的105倍;随着入射功率的增大,其非线性折射率逐渐减小,在峰值光强达到85GW/cm^2后趋于常数不变。结果表明,碲化铋是一种高非线性光学材料,有望应用于全光信号处理、光开关等方面。In order to study nonlinear refractive index of bismuth telluride , a 3-D topological insulator , nonlinear refractive index of 800 nm femtosecond pulse laser was measured by reflection z-scan method .After theoretical calculation and experimental data fitting, nonlinear refractive index of bismuth telluride crystal could reach the order of magnitude of 10 -14 m2/W, 105 times of that of quartz.Nonlinear refractive index decreased with the increase of incident power .Until peak intensity reached 85GW/cm2, nonlinear refractive index tended to be a constant .The results show that bismuth telluride is a remarkable nonlinear optical material which has huge potential in the application of all-optical signal processing and optical switching .

关 键 词：非线性光学 非线性折射率 反射z扫描 碲化铋 

分 类 号：O437[机械工程—光学工程]