强激光与粒子束, 2015, 27 (8): 081007, 网络出版: 2015-08-25
硒化镉载流子的超快动力学研究
Ultrafast dynamics of carriers in cadmium selenide
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1030 nm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.
Abstract
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,free-carrier 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.
张健, 易涛, 刘慎业, 江少恩, 杨为明, 吴幸智, 方宇, 宋瑛林. 硒化镉载流子的超快动力学研究[J]. 强激光与粒子束, 2015, 27(8): 081007. Zhang Jian, Yi Tao, Liu Shenye, Jiang Shaoen, Yang Weiming, Wu Xingzhi, Fang Yu, Song Yinglin. Ultrafast dynamics of carriers in cadmium selenide[J]. High Power Laser and Particle Beams, 2015, 27(8): 081007.
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