High-temperature operation of 8.5 μm distributed feedback quantum cascade lasers

被引：2
作者：
State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China [1 ]
机构：
[1] State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences
来源：
Chin. Phys. Lett. | 2009年 / 8卷
关键词：
11;
D O I：
10.1088/0256-307X/26/8/087804
中图分类号：
学科分类号：
摘要：
We present a distributed feedback quantum cascade laser (DFB-QCL) emitting at a wavelength of 8.5 μm and operating up to 420 K (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 420 K, a low-threshold current density of 3.28 kA/cm2 and a single mode peak power of 15mW are achieved on an epilayer-up mounting device with ridge width of 26 μm and cavity length of 3.0 mm. A side mode suppression ratio of 25 dB at 420 K is obtained. © 2009 Chinese Physical Society and IOP Publishing Ltd.
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