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Intersubband Absorption in Terahertz Lasers Based on Optically Pumped Quantum Well Structures

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Abstract

We study the effects of microscopic dynamics of electrons on the intersubband optical absorption in terahertz lasers based on optically pumped quantum wells (THz-OPQW). The ensemble Monte Carlo method is used to include different electron scattering mechanisms in the calculation, so that the dependence of intersubband absorption lineshape on microscopic dynamics of electrons can be easily investigated. We find that electron-electron scattering is the dominant factor to determine the absorption linewidth. The real distributions of hot electrons are included to study the temporal changes of the spectra lineshape. Our findings show that the dependence of spectral lineshape on electron population essentially results from the electron scattering and the non-Fermi electron energy distribution.

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Acknowledgments

The authors are sincerely grateful to National Science Foundation of China (Grant No. 60771056) and National Science Foundation of Guangdong Province (Grant No. 5001835) for funding the research.

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Authors and Affiliations

  1. School of Information Engineering, Guangdong University of Technology, Guangzhou, 510006, People’s Republic of China

    Dong-Feng Liu, Jian-Gang Jiang & Jia-Feng He

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  1. Dong-Feng Liu
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  2. Jian-Gang Jiang
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  3. Jia-Feng He
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Correspondence to Dong-Feng Liu.

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Liu, DF., Jiang, JG. & He, JF. Intersubband Absorption in Terahertz Lasers Based on Optically Pumped Quantum Well Structures. J Infrared Milli Terahz Waves 34, 598–605 (2013). https://doi.org/10.1007/s10762-013-0010-7

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  • DOI: https://doi.org/10.1007/s10762-013-0010-7

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