Phase-locked single-mode terahertz quantum cascade lasers array  

作　　者：Yunfei Xu Weijiang Li Yu Ma Quanyong Lu Jinchuan Zhang Shenqiang Zhai Ning Zhuo Junqi Liu Shuman Liu Fengmin Cheng Lijun Wang Fengqi Liu 

机构地区：[1]Key Laboratory of Semiconductor Materials Science,Institute of Semiconductors,Chinese Academy of Sciences,Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices,Beijing100083,China [2]Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China [3]Division of Quantum Materials and Devices,Beijing Academy of Quantum Information Sciences,Beijing 100193,China

出　　处：《Journal of Semiconductors》2024年第6期87-91,共5页半导体学报（英文版）

基　　金：funded by National Natural Science Foundation of China, grant numbers 62335006, 62274014, 62235016, 61734006, 61835011, 61991430;funded by Key Program of the Chinese Academy of Sciences, grant numbers XDB43000000, QYZDJSSW-JSC027;Beijing Municipal Science & Technology Commission, grant number Z221100002722018

摘　　要：We demonstrated a scheme of phase-locked terahertz quantum cascade lasers(THz QCLs)array,with a single-mode pulse power of 108 mW at 13 K.The device utilizes a Talbot cavity to achieve phase locking among five ridge lasers with first-order buried distributed feedback(DFB)grating,resulting in nearly five times amplification of the single-mode power.Due to the optimum length of Talbot cavity depends on wavelength,the combination of Talbot cavity with the DFB grating leads to better power amplification than the combination with multimode Fabry-Perot(F-P)cavities.The Talbot cavity facet reflects light back to the ridge array direction and achieves self-imaging in the array,enabling phase-locked operation of ridges.We set the spacing between adjacent elements to be 220μm,much larger than the free-space wavelength,ensuring the operation of the fundamental supermode throughout the laser's dynamic range and obtaining a high-brightness far-field distribution.This scheme provides a new approach for enhancing the single-mode power of THz QCLs.

关 键 词：quantum cascade lasers phase locking TERAHERTZ single mode 

分 类 号：TN2[电子电信—物理电子学]