红外与毫米波学报2017，Vol.36Issue(6)：706-712,7.DOI:10.11972/j.issn.1001-9014.2017.06.012
基于衍射光栅耦合输出的一级分布反馈太赫兹量子级联激光器
Terahertz first-order distributed feedback quantum cascade laser with light extraction via a diffraction grating
摘要
Abstract
We have studied two different kinds of terahertz first-order distributed feedback quantum cascade lasers (THz-DFB-QCL),both of which are based on a metal-metal waveguide.To realize stable single-mode emission,we have demonstrated for the first time THz-DFB-QCLs in which THz wave is extracted via a diffraction grating.Our simulations illustrate that an optimized diffraction grating will give rise to a diffraction efficiency of about 70％,and a reflectivity less than 1％.It will also result in a laser beam pattern with a low divergence angle of 10° × 50°.Such a low reflectivity will keep the mode oscillation inside the DFB grating undisturbed,which is crucial to realize stable single-mode emission.Experimentally,by utilizing a diffraction grating to extract THz wave,we have realized THz-DFB-QCLs with stable single-mode emission near 2.58 THz and the side-mode-suppression-ratio is about 23 dB.The measured laser beam pattern is in good agreement with the calculations.Most importantly,due to the good diffraction efficiency and beam directionality,the diffraction grating based THz-DFB-QCL significantly improves the output power compared with the edge-emitting counterpart.关键词
太赫兹/一级分布反馈/量子级联激光器/衍射光栅Key words
terahertz/first-order distributed feedback/quantum cascade lasers/diffraction grating分类
信息技术与安全科学引用本文复制引用
朱欢,王芳芳,颜全,俞辰韧,常高垒,陈建新,徐刚毅,何力..基于衍射光栅耦合输出的一级分布反馈太赫兹量子级联激光器[J].红外与毫米波学报,2017,36(6):706-712,7.基金项目
中国科学院百人计划,国家自然科学基金项目(61574149),国家重点研发计划(2016YFB0402303、2016YFA0202200),预研项目(41414020901),中国科学院创新实验室基金项目(CXJJ-15S098) （61574149）
Supported by the 100 Talents Project of Chinese Academy of Sciences,National Natural Science Foundation of China (61574149),National Key R&D Plan(2016YFB0402303、2016YFA0202200),Pre-research Foundation(41414020901),and Foundation of Innovation Laboratory of Chinese Academy of Sciences (CXJJ-15S098) （61574149）
