Terahertz quantum cascade lasers with sampled lateral gratings for single mode operation

In this paper, we presented single mode terahertz quantum cascade lasers (THz QCLs) with sampled lateral grating emitting approximately 3.4 THz. Due to strong mode selection, the implementation of sampled lateral grating on THz QCL ridges can result in stable single longitudinal mode emission with a...

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Bibliographic Details
Published in:Frontiers of Optoelectronics (Online) 2021-03, Vol.14 (1), p.94-98
Main Authors: SHAO, Dixiang, YAO, Chen, FU, Zhanglong, WAN, Wenjian, LI, Ziping, CAO, Juncheng
Format: Article
Language:English
Subjects:
Biomedical Engineering and Bioengineering
Electrical Engineering
Engineering
Far fields
Modal choice
Physics
quantum cascade laser (QCL)
Quantum cascade lasers
Research Article
sampled lateral grating
Single mode operation
terahertz (THz)
Terahertz Science and Applications
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Summary:In this paper, we presented single mode terahertz quantum cascade lasers (THz QCLs) with sampled lateral grating emitting approximately 3.4 THz. Due to strong mode selection, the implementation of sampled lateral grating on THz QCL ridges can result in stable single longitudinal mode emission with a side-mode suppression ratio larger than 20 dB. The measured peak power of the grating laser is improved by about 11.8% compared to the power of devices with uniform distributed feedback gratings. Furthermore, the far-field pattern of the presented device is uninfluenced by grating structures.
ISSN:2095-2759
2095-2767
DOI:10.1007/s12200-020-1083-2