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Photonics
Volume 12
Issue 2
10.3390/photonics12020129
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This is an early access version, the complete PDF, HTML, and XML versions will be available soon.
Article

Continuous-Wave Room-Temperature External Cavity Quantum Cascade Lasers Operating at λ~8.5 μm

by
Zixian Wang
1,2,
Yuzhe Lin
1,
Yuan Ma
1,2,
Chenyang Wan
1,2,
Fengxin Dong
3,
Xuyan Zhou
1,3,
Jinchuan Zhang
1,
Fengqi Liu
1 and
Wanhua Zheng
1,*
1
Laboratory of Solid State Optoelectronics Information Technology, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
2
Center of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
3
Weifang Academy of Advanced Opto-Electronic Circuits, Weifang 261021, China
*
Author to whom correspondence should be addressed.
Photonics 2025, 12(2), 129; https://doi.org/10.3390/photonics12020129
Submission received: 12 January 2025 / Revised: 29 January 2025 / Accepted: 29 January 2025 / Published: 31 January 2025
(This article belongs to the Special Issue The Three-Decade Journey of Quantum Cascade Lasers)
Review Reports Versions Notes

Abstract

External cavity quantum cascade lasers (EC-QCLs) utilizing the Littrow configuration and operating at an approximate wavelength of 8.5 μm have been successfully demonstrated in continuous wave operations at room temperature. Our work provides ideas and experimental support for the optimization of the EC-QCL which indicate optimal EC-QCL performance with an external cavity length of 25 cm and investigates the impact of various parameters, including injection current and temperature on the performance of the EC-QCL. In the absence of anti-reflection (AR) coating, the tuning range at 25 °C extends up to 103.3 cm−1, while the maximum side mode suppression ratio (SMSR) reaches 30.8 dB, accompanied by a full width half maximum linewidth (FWHM) of 0.76 nm.
Keywords: external cavity; quantum cascade laser; single-mode; wavelength tunable external cavity; quantum cascade laser; single-mode; wavelength tunable

Share and Cite

MDPI and ACS Style

Wang, Z.; Lin, Y.; Ma, Y.; Wan, C.; Dong, F.; Zhou, X.; Zhang, J.; Liu, F.; Zheng, W. Continuous-Wave Room-Temperature External Cavity Quantum Cascade Lasers Operating at λ~8.5 μm. Photonics 2025, 12, 129. https://doi.org/10.3390/photonics12020129

AMA Style

Wang Z, Lin Y, Ma Y, Wan C, Dong F, Zhou X, Zhang J, Liu F, Zheng W. Continuous-Wave Room-Temperature External Cavity Quantum Cascade Lasers Operating at λ~8.5 μm. Photonics. 2025; 12(2):129. https://doi.org/10.3390/photonics12020129

Chicago/Turabian Style

Wang, Zixian, Yuzhe Lin, Yuan Ma, Chenyang Wan, Fengxin Dong, Xuyan Zhou, Jinchuan Zhang, Fengqi Liu, and Wanhua Zheng. 2025. "Continuous-Wave Room-Temperature External Cavity Quantum Cascade Lasers Operating at λ~8.5 μm" Photonics 12, no. 2: 129. https://doi.org/10.3390/photonics12020129

APA Style

Wang, Z., Lin, Y., Ma, Y., Wan, C., Dong, F., Zhou, X., Zhang, J., Liu, F., & Zheng, W. (2025). Continuous-Wave Room-Temperature External Cavity Quantum Cascade Lasers Operating at λ~8.5 μm. Photonics, 12(2), 129. https://doi.org/10.3390/photonics12020129

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