Chin. Phys. Lett.  2009, Vol. 26 Issue (8): 087804    DOI: 10.1088/0256-307X/26/8/087804
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
High-Temperature Operation of 8.5μm Distributed Feedback Quantum Cascade Lasers
LI Yao-Yao, LI Ai-Zhen, WEI Lin, LI Hua, XU Gang-Yi, ZHANG Yong-Gang
State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050
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LI Yao-Yao, LI Ai-Zhen, WEI Lin et al  2009 Chin. Phys. Lett. 26 087804
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Abstract We present a distributed feedback quantum cascade laser (DFB-QCL) emitting at a wavelength of 8.5μm and operating up to 420K (147°C) with a low-threshold current density in pulsed mode. The DFB-QCLs studied are based on a four-well active design; the central portion of the waveguide consists of 60 periods of lattice matched InP-based InGaAs/AlInAs. In the design of the device, an active structure with lower doping and a deep-top grating process are utilized to achieve high temperature operation with a lower-threshold current density. At 420K, a low-threshold current density of 3.28kA/cm2 and a single mode peak power of 15mW are achieved on an epilayer-up mounting device with ridge width of 26μm and cavity length of 3.0mm. A side mode suppression ratio of 25dB at 420K is obtained.
Keywords: 78.67.De      73.63.Hs     
Received: 06 January 2009      Published: 30 July 2009
PACS:  78.67.De (Quantum wells)  
  73.63.Hs (Quantum wells)  
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https://cpl.iphy.ac.cn/10.1088/0256-307X/26/8/087804       OR      https://cpl.iphy.ac.cn/Y2009/V26/I8/087804
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LI Yao-Yao
LI Ai-Zhen
WEI Lin
LI Hua
XU Gang-Yi
ZHANG Yong-Gang
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