太赫兹量子级联激光器及其光束表征技术  

Terahertz Quantum-Cascade Laser and its beam pattern characterization

作　　者：谭智勇[1] 曹俊诚[1] 

机构地区：[1]中国科学院上海微系统与信息技术研究所太赫兹固态技术重点实验室,上海200050

出　　处：《太赫兹科学与电子信息学报》2013年第1期21-25,共5页Journal of Terahertz Science and Electronic Information Technology

基　　金：科技部863主题项目(2011AA010205);国家自然科学基金资助项目(61131006;61021064);国家重大科学仪器设备开发专项(2011YQ150021);中科院重要方向项目(YYYJ-1123-1);上海市基础研究重点基金资助项目(10JC1417000);上海市自然科学基金资助项目(11ZR1444200)

摘　　要：简要介绍太赫兹量子级联激光器(THz QCL)的工作原理及其进展。研究多个器件输出激光的光束质量,分别采用热探测器阵列和THz量子阱探测器(THz QWP)表征连续激射和脉冲激射THz QCL激光的光束图形,对比分析不同热探测器阵列对THz激光的表征能力,比较热探测器阵列和THz照相机对平行THz激光表征的差异。分析光束改善后THz激光光斑的尺寸、二维强度分布等特点,根据对THz QCL输出激光的改善效果,给出采用外部手段改善THz QCL激光光束的几种方法。研究表明,除了采用精细的波导工艺之外,锗(Ge)透镜、超半球高阻硅透镜和聚乙烯透镜都是外部改善技术中很好的手段。The principle and recent progress of the Terahertz Quantum-Cascade Lasers（QCL） are briefly introduced. The beam quality of different THz QCLs is studied. Beam patterns of continuous wave and pulse modes emitting devices are characterized by employing thermal detector arrays and THz Quantum-Well Photodetector（THz QWP）, respectively. The detecting abilities of different arrays are compared and analyzed, and the differences in THz light characterizing between the array and THz camera are also compared. According to the results of the beam improvements, some methods of beam improvement for THz light from the THz QCL are put forward. The germanium（Ge） lens, silicon hyper hemisphere（high resistance） lens and polythene lens are good tools for improving the beam quality of THz QCLs except for employing fine waveguide fabrication process.

关 键 词：太赫兹 量子级联激光器 光束表征 量子阱探测器 热探测器阵列 

分 类 号：TN248[电子电信—物理电子学]