Phase-locked single-mode terahertz quantum cascade lasers arrayOACSTPCDEI
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.
Yunfei Xu;Weijiang Li;Yu Ma;Quanyong Lu;Jinchuan Zhang;Shenqiang Zhai;Ning Zhuo;Junqi Liu;Shuman Liu;Fengmin Cheng;Lijun Wang;Fengqi Liu;
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 Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,ChinaDivision of Quantum Materials and Devices,Beijing Academy of Quantum Information Sciences,Beijing 100193,ChinaKey Laboratory of Semiconductor Materials Science,Institute of Semiconductors,Chinese Academy of Sciences,Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices,Beijing100083,China
电子信息工程
quantum cascade lasersphase lockingterahertzsingle mode
《Journal of Semiconductors》 2024 (006)
P.87-91 / 5
funded by National Natural Science Foundation of China,grant numbers 62335006,62274014,62235016,61734006,61835011,61991430;was funded by Key Program of the Chinese Academy of Sciences,grant numbers XDB43000000,QYZDJSSWJSC027,and Beijing Municipal Science&Technology Commission,grant number Z221100002722018.
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