Anomalous Mode Transitions in High Power Distributed Bragg Reflector Quantum Cascade Lasers

Nanoscale Research Letters

Ning Zhuo¹  Li-Jun Wang¹  Jun-Qi Liu¹  Feng-Min Cheng¹  Shen-Qiang Zhai¹  Jin-Chuan Zhang¹  Zeng-hui Gu¹  Zhan-Guo Wang¹  Dong-Bo Wang¹  Shu-Man Liu¹  Feng-Qi Liu¹ 

[1] Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices;

关键词: Anomalous mode transitions;    Quantum cascade laser;    Distributed Bragg reflector;   

DOI  :  10.1186/s11671-019-3151-3

来源: DOAJ

【 摘 要 】

Abstract In this paper, an anomalous spectral data of distributed Bragg reflector (DBR) quantum cascade lasers (QCLs) emitting around 7.6 μm is presented. The two-section DBR lasers, consisting of a gain section and an unpumped Bragg reflector, display an output power above 0.6 W in continuous wave (CW) mode at room temperature. The anomalous spectral data is defined as a longitudinal mode which moves toward shorter wavelengths with increasing temperature or injection current, which is unexpected. Although the longer wavelength modes are expected to start lasing when raising device temperature or injection current, occasional mode hops to a shorter wavelength are seen. These anomalous mode transitions are explained by means of modal analysis. The thermal-induced change of the refractive index implied by an increase in the temperature or injection current yields nearly periodic transitions between cavity modes.

【 授权许可】

Unknown