| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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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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| Cite this article: |
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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.
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| Keywords:
78.67.De
73.63.Hs
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Received: 06 January 2009
Published: 30 July 2009
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