硒化镉载流子的超快动力学研究  

Ultrafast dynamics of carriers in cadmium selenide

作　　者：张健[1] 易涛[1] 刘慎业[1] 江少恩[1] 杨为明[1] 吴幸智 方宇[2] 宋瑛林[2] 

机构地区：[1]中国工程物理研究院激光聚变研究中心,四川绵阳621900 [2]苏州大学物理科学与技术学院,江苏苏州215006

出　　处：《强激光与粒子束》2015年第8期35-39,共5页High Power Laser and Particle Beams

基　　金：中国工程物理研究院科学技术发展基金项目(2014B0102011;2014B0102012)

摘　　要：硒化镉是一种可用于X射线全光分幅相机和全光条纹相机的重要探测材料。用基于相位物体的泵浦探测方式,研究了硒化镉在1030nm波长,飞秒脉冲下的载流子超快动力学和非线性光学特性。得到了双光子吸收系数、载流子吸收截面、载流子复合时间等参数。实验表明,硒化镉载流子的动力学和非线性特性是由束缚电子和载流子共同决定的。束缚电子的克尔效应和双光子激发都是瞬态的,而载流子复合持续了较长时间。这些参数和载流子图像的的获得,为X射线超快探测器件的设计和改进提供了参考。Cadmium selenide can be used in the all optical framing camera and streak camera for ultrafast X-ray detection.Based on time-resolved pumping system with phase object,we studied the nonlinear properties of bulk cadmium selenide at 1030 nm under femtosecond pulse by two-photon absorption and got the nonlinear properties of two-photon absorbing coefficient,freecarrier absorption cross section,and free-carrier life time.According to the experiment,the nonliear response of cadmium selenide is a combination of bound-electron effects and two-photon-induced free-carrier effects.The Kerr effect and the two-photon excitation are transient,and the free-carrier recombination lasts for a long time.The experiment has provided useful data of carrier parameters and images foe design.

关 键 词：硒化镉 半导体 探测器 非线性 载流子 

分 类 号：O472[理学—半导体物理]