Improvement of λ≈5 μm quantum cascade lasers by blocking barriers in the active regions
Improvement of λ≈5 μm quantum cascade lasers by blocking barriers in the active regions
复制标题
通过阻挡有源区域的势垒改进 λ≈5 μm 量子级联激光器
DOI：
10.1063/1.1462866
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发表时间：
2002
影响因子：
4
通讯作者：
J. Wagner
中科院分区：
文献类型：
--
作者：
Q. Yang;C. Mann;F. Fuchs;R. Kiefer;K. Köhler;N. Rollbühler;H. Schneider;J. Wagner
本文报道了在有源区引入AlAs阻挡层和InAs应变补偿层对波长为λ <$5 μm的量子级联激光器的改进。阻挡势垒被设计为选择性地防止初始激光状态中的电子隧穿出有源区，同时保持最终激光状态中的电子的高隧穿概率。采用阻挡层后，器件在77 K（300 K）时的最大单端面峰值功率从285 mW（30 mW）提高到900 mW（240 mW），脉冲模式下的最高工作温度从320 K提高到350 K。
We report the improvement of quantum cascade lasers emitting at λ∼5 μm by introducing AlAs blocking barriers together with strain-compensating InAs layers into the active regions. The blocking barriers are designed to selectively prevent electrons in the initial laser state from tunneling out of the active region, while maintaining the high tunneling probabilities of the electrons in the final laser states. Adopting blocking barriers, the maximum peak power per facet at 77 K (300 K) is increased from 285 (30 mW) to 900 mW (240 mW), and the maximum operation temperature in pulsed mode has been improved from 320 to 350 K with respect to a reference sample without blocking barriers.