Digitally graded GaAs/Al_0.44Ga_0.56As quantum-cascade laser

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• 作者：Indjin ; D. ; Tomic ; S. ; Ikonic ; Z. ; Harrison ; P. ; Kelsall ; R.W. ; Milanovic ; V. ; Kocinac ; S.
• 关键词：Quantum-cascade laser ; Gain optimization
• 刊名：Physica E
• 出版年：2003
• 出版时间：April, 2003
• 年：2003
• 卷：17
• 期：Complete
• 页码：620-622
• 全文大小：76.0 K

文摘

A method for the optimal design and realization of a GaAs/Al_0.44Ga_0.56As quantum-cascade laser (QCL) is presented. Firstly, an optimal, smooth active region profile is derived, using inverse spectral theory. A digitally graded laser structure is then designed, having an approximately equivalent potential profile. The gain and threshold current of the optimized device are calculated using a 15-level self-consistent rate equation model, and are shown to represent substantial improvements over the figures obtained, using the same calculation method, for the recently reported room temperature GaAs/Al_0.44Ga_0.56As QCL of Page et al. (Appl. Phys. Lett. 78 (2001) 3529).