Strong Optical Feedback Stabilized Quantum Cascade Laser

被引：36
作者：
Zhao, Binbin [1 ,2 ,3 ]
Wang, Xingguang [1 ,2 ,3 ]
Wang, Cheng [1 ]
机构：
[1] ShanghaiTech Univ, Sch Informat Sci & Technol, Shanghai 201210, Peoples R China
[2] Chinese Acad Sci, Shanghai Inst Microsyst & Informat Technol, Shanghai 200050, Peoples R China
[3] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
来源：
ACS PHOTONICS | 2020年 / 7卷 / 05期
基金：
中国国家自然科学基金;
关键词：
semiconductor laser; quantum cascade laser; frequency noise; spectral line width; optical feedback; gas sensing; FREQUENCY-NOISE; SPECTRAL LINEWIDTH; SEMICONDUCTOR-LASER; INTRINSIC LINEWIDTH; NARROW-LINEWIDTH; REDUCTION; INJECTION; OPERATION; REGIMES;
D O I：
10.1021/acsphotonics.0c00189
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
A narrow-line-width quantum cascade laser (QCL) is highly demanded for high-resolution spectroscopy of narrow molecule absorption lines. This work shows a low-noise QCL stabilized by strong optical feedback without any feedback phase control. Although optical feedback is usually detrimental to the stability of laser diodes, the QCL is highly stable against optical feedback. The stabilized QCL line width is proved to be insensitive to the feedback phase, as long as the feedback strength is strong enough. Therefore, fine control of feedback length on the subwavelength scale is not required, which significantly simplifies the experimental setup. Using this simple approach, we demonstrate that the QCL line width is narrowed from 7.6 MHz down to 107 kHz. Meanwhile, the frequency noise below 100 kHz Fourier frequency is reduced by about 40 dB
引用
收藏
页码：1255 / 1261
页数：7
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