Beat note analysis and spectral modulation of terahertz quantum cascade lasers with radio frequency injection  

作　　者：朱永浩 黎华 万文坚 顾立 周涛 Stefano Barbieri 曹俊诚 

机构地区：[1]Key Laboratory of Terahertz Solid State Technology,Shanghai Institute of Microsystem and Information Technology,Chinese Academy of Sciences,Shanghai 200050,China [2]Laboratoire Materiaux et Phenomenes Ouantiques,Universite Paris Diderot and CNRS,UMR 7162,10 rue A.Domont et L.Duquet,Paris 75205,France

出　　处：《Chinese Optics Letters》2017年第1期95-99,共5页中国光学快报（英文版）

基　　金：supported by the“Hundred-Talent”Program of Chinese Academy of Sciences;the National Natural Science Foundation of China(No.61575214);the Shanghai Municipal Commission of Science and Technology(Nos.14530711300,15560722000,and 15ZR1447500);the National 973 Program of China(No.2014CB339803);the Major National Development Project of Scientific Instrument and Equipment(No.2011YQ150021)

摘　　要：We demonstrate the electrical beat note analysis and radio frequency （RF） injection locking of a continuous wave （cw） terahertz quantum cascade laser （QCL） emitting around 3 THz （-100 μm）. In free running the beat note frequency of the QCL shows a shift of ~180 MHz with increasing drive current. The beat note, modulation response, injection pulling, and terahertz emission spectral characteristics in the different current regimes Ⅰ, Ⅱ, and Ⅲ are investigated. The results show that in the current regime I close to the laser threshold we obtain a narrower beat note and flat response to the RF modulation at the cavity round trip frequency. The pulling effect and spectral modulation measurements verify that in the current regime I the RF injection locking is more ef- ficient and a robust tool to modulate the mode number and mode frequency of terahertz QCLs.We demonstrate the electrical beat note analysis and radio frequency （RF） injection locking of a continuous wave （cw） terahertz quantum cascade laser （QCL） emitting around 3 THz （-100 μm）. In free running the beat note frequency of the QCL shows a shift of ~180 MHz with increasing drive current. The beat note, modulation response, injection pulling, and terahertz emission spectral characteristics in the different current regimes Ⅰ, Ⅱ, and Ⅲ are investigated. The results show that in the current regime I close to the laser threshold we obtain a narrower beat note and flat response to the RF modulation at the cavity round trip frequency. The pulling effect and spectral modulation measurements verify that in the current regime I the RF injection locking is more ef- ficient and a robust tool to modulate the mode number and mode frequency of terahertz QCLs.

关 键 词：MODULATION Quantum cascade lasers Radio waves Semiconductor lasers Spectroscopy 

分 类 号：TN248[电子电信—物理电子学]