Lasers, Fiber Optics, and Communications

Low-threshold external-cavity quantum cascade laser around 7.2 μm

[+] Author Affiliations
Zhibin Zhao, Lijun Wang, Zhiwei Jia, Jinchuan Zhang, Fengqi Liu, Ning Zhuo, Shenqiang Zhai, Junqi Liu, Zhanguo Wang

Institute of Semiconductors, Chinese Academy of Sciences, Key Laboratory of Semiconductor Materials Science, No. A35, Qinghua East Road, Beijing 100083, China

Opt. Eng. 55(4), 046116 (Apr 27, 2016). doi:10.1117/1.OE.55.4.046116
History: Received January 20, 2016; Accepted April 11, 2016
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Abstract.  Room-temperature continuous wave (CW) operation of a tunable external-cavity quantum cascade laser (EC-QCL) at center wavelength around 7.2  μm is presented. The EC-QCL was implemented in a Littrow configuration. The gain chip is based on a diagonal bound-to-continuum design with a high-reflection coating on the back facet. A two-layer antireflection (AR) coating consisting of Al2O3 and ZnSe was designed and deposited on the front facet of the chip to suppress the Fabry–Pérot modes. With this AR coating, single-mode tuning range of 128  cm1 was achieved, from 1346.7 to 1475.3  cm1 (6.78 to 7.43  μm). High side-mode suppression ratio over 30 dB was achieved near the center gain region. A very low-threshold current density of 0.89  kA/cm2 and a high output power of 50 mW were obtained when the EC-QCL was operated in CW mode at 20°C.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Zhibin Zhao ; Lijun Wang ; Zhiwei Jia ; Jinchuan Zhang ; Fengqi Liu, et al.
"Low-threshold external-cavity quantum cascade laser around 7.2 μm", Opt. Eng. 55(4), 046116 (Apr 27, 2016). ; http://dx.doi.org/10.1117/1.OE.55.4.046116


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