Journal
OPTICS EXPRESS
Volume 21, Issue 23, Pages 27804-27815Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.21.027804
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Funding
- Nanyang Technological University (NTU) [M58040017]
- Defence Research and Technology Office, Singapore [TL9009105606-01]
- Ministry of Education, Singapore [MOE2011-T2-2-147]
- CNRS International-NTU-Thales Research Alliance (CINTRA) Laboratory, UMI 3288, Singapore 637553
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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. (C) 2013 Optical Society of America
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