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Title: Importance of the microscopic effects on the linewidth enhancement factor of quantum cascade lasers
Authors: Liu, Tao
Lee, Kenneth E.
Wang, Qi Jie
Keywords: DRNTU::Science::Physics::Optics and light
Issue Date: 2013
Source: Liu, T., Lee, K. E., & Wang, Q. J. (2013). Importance of the microscopic effects on the linewidth enhancement factor of quantum cascade lasers. Optics express, 21(23), 27804-27815.
Series/Report no.: Optics express
Abstract: Microscopic density matrix analysis on the linewidth enhancement factor (LEF) of both mid-infrared (mid-IR) and Terahertz (THz) quantum cascade lasers (QCLs) is reported, taking into account of the many body Coulomb interactions, coherence of resonant-tunneling transport and non-parabolicity. A non-zero LEF at the gain peak is obtained due to these combined microscopic effects. The results show that, for mid-IR QCLs, the many body Coulomb interaction and non-parabolicity contribute greatly to the non-zero LEF. In contrast, for THz QCLs, the many body Coulomb interactions and the resonant-tunneling effects greatly influence the LEF resulting in a non-zero value at the gain peak. This microscopic model not only partially explains the non-zero LEF of QCLs at the gain peak, which observed in the experiments for a while but cannot be explicitly explained, but also can be employed to improve the active region designs so as to reduce the LEF by optimizing the corresponding parameters.
ISSN: 1094-4087
DOI: 10.1364/OE.21.027804
Rights: © 2013 Optical Society of America. This paper was published in Optics Express and is made available as an electronic reprint (preprint) with permission of Optical Society of America. The paper can be found at the following official DOI: []. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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