Flat Top Optical Frequency Combs Based on a Single-Core Quantum Cascade Laser at Wavelength of~8.7μm  

作　　者：马钰 李伟江 许云飞 刘俊岐 卓宁 杨科 张锦川 翟慎强 刘舒曼 王利军 刘峰奇 Yu Ma;Wei-Jiang Li;Yun-Fei Xu;Jun-Qi Liu;Ning Zhuo;Ke Yang;Jin-Chuan Zhang;Shen-Qiang Zhai;Shu-Man Liu;Li-Jun Wang;Feng-Qi Liu(Key Laboratory of Semiconductor Materials Science,and Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices,Institute of Semiconductors,Chinese Academy of Sciences,Beijing 100083,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]Key Laboratory of Semiconductor Materials Science,and Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices,Institute of Semiconductors,Chinese Academy of Sciences,Beijing 100083,China [2]Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Chinese Physics Letters》2023年第1期28-32,共5页中国物理快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.61734006,61835011,61991430,and 62174158);the Youth Innovation Promotion Association of the Chinese Academy of Sciences(Grant No.2021107);the Key Program of the Chinese Academy of Sciences(Grant Nos.XDB43000000,YJKYYQ20190002,and QYZDJ-SSW-JSC027)。

摘　　要：We present optical frequency combs with a spectral emission of 48 cm-1and an output power of 420 m W based on a single-core quantum cascade laser at λ ~ 8.7μm. A flat top spectrum sustains up to 130 comb modes delivering ~ 3.2 m W of optical power per mode, making it a valuable tool for dual comb spectroscopy. The homogeneous gain medium, relying on a slightly diagonal bound-to-continuum structure, promises to provide a broad and stable gain for comb operating. Remarkably, the dispersion of this device is measured within 300 fs2/mm to ensure stable comb operation over 90% of the total current range. The comb is observed with a narrow beatnote linewidth around 2 k Hz and has weak dependence on the applied current for stable comb operation.

关 键 词：QUANTUM NARROW DISPERSION 

分 类 号：TN248[电子电信—物理电子学]