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

Zhibin Zhao; Lijun Wang; Zhiwei Jia; Jinchuan Zhang; Fengqi Liu; Ning Zhuo; Shenqiang Zhai; Junqi Liu; Zhanguo Wang

doi:10.1117/1.OE.55.4.046116

27 April 2016 Low-threshold external-cavity quantum cascade laser around 7.2 μm

Zhibin Zhao, Lijun Wang, Zhiwei Jia, Jinchuan Zhang, Fengqi Liu, Ning Zhuo, Shenqiang Zhai, Junqi Liu, Zhanguo Wang

Author Affiliations +

Optical Engineering, Vol. 55, Issue 4, 046116 (April 2016). https://doi.org/10.1117/1.OE.55.4.046116

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 cm−¹ was achieved, from 1346.7 to 1475.3 cm−¹ (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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Zhibin Zhao, Lijun Wang, Zhiwei Jia, Jinchuan Zhang, Fengqi Liu, Ning Zhuo, Shenqiang Zhai, Junqi Liu, and Zhanguo Wang "Low-threshold external-cavity quantum cascade laser around 7.2 μm," Optical Engineering 55(4), 046116 (27 April 2016). https://doi.org/10.1117/1.OE.55.4.046116

Published: 27 April 2016

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