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Applied Physics Letters / Volume 94 / Issue 15 / LASERS, OPTICS, AND OPTOELECTRONICS

Appl. Phys. Lett. 94, 151109 (2009); http://dx.doi.org/10.1063/1.3119312 (3 pages)

Nonequilibrium Green’s function calculation for four-level scheme terahertz quantum cascade lasers

H. Yasuda1,2, T. Kubis3, P. Vogl3, N. Sekine2, I. Hosako2, and K. Hirakawa1

1Institute of Industrial Science and Institute for Nano Quantum Information Electronics, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
2National Institute of Information and Communications Technology, 4-2-1, Nukui-Kitamachi, Koganei, Tokyo 184-8795, Japan
3Walter Schottky Institute, Technische Universität München, Am Coulombwall 3, 85748 Garching, Germany

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(Received 18 February 2009; accepted 23 March 2009; published online 15 April 2009)

We have calculated the performance of a recently proposed four-level scheme terahertz quantum cascade laser (4L terahertz-QCL) with the nonequilibrium Green’s function method. The calculation result for 40 K showed that the 4L QCL has a larger terahertz gain than the conventional resonant phonon QCL. This is because a large number of electrons accumulate in the upper lasing level and contribute to lasing in the new scheme. When the temperature is increased, the advantage of gain decreases due to thermally activated phonon scattering.

© 2009 American Institute of Physics

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KEYWORDS and PACS

Keywords

Green's function methods, high-temperature techniques, laser beams, quantum cascade lasers, submillimetre wave lasers

PACS

  • 42.55.Px

    Semiconductor lasers; laser diodes

  • 42.60.By

    Design of specific laser systems

  • 42.60.Jf

    Beam characteristics: profile, intensity, and power; spatial pattern formation

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3119312

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
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