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Optically pumped terahertz laser based on intersubband transitions in a GaN/AlGaN double quantum well

Vukmirovic, N., Jovanovic, V.D., Indjin, D., Ikonic, Z., Harrison, P. and Milanovic, V. (2005) Optically pumped terahertz laser based on intersubband transitions in a GaN/AlGaN double quantum well. Journal of Applied Physics, 97 (10). 103106-(5 pages). ISSN 1089-7550

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A design for a GaN/AlGaN optically pumped terahertz laser emitting at 34 µm (ΔE~36 meV) is presented. This laser uses a simple three-level scheme where the depopulation of the lower laser level is achieved via resonant longitudinal-optical-phonon emission. The quasibound energies and associated wave functions are calculated with the intrinsic electric field induced by the piezoelectric and the spontaneous polarizations. The structures based on a double quantum well were simulated and the output characteristics extracted using a fully self-consistent rate equation model with all relevant scattering processes included. Both electron-longitudinal-optical phonon and electron-acoustic-phonon interactions were taken into account. The carrier distribution in subbands was assumed to be Fermi–Dirac-like, with electron temperature equal to the lattice temperature, but with different Fermi levels for each subband. A population inversion of 12% for a pumping flux Φ=10(27) cm(–2) s(–1) at room temperature was calculated for the optimized structure. By comparing the calculated modal gain and estimated waveguide and mirror losses the feasibility of laser action up to room temperature is predicted.

Item Type: Article
Copyright, Publisher and Additional Information: Copyright © 2005 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. This is an author produced version of a paper published in Journal of Applied Physics.
Institution: The University of Leeds
Academic Units: The University of Leeds > Faculty of Engineering (Leeds) > School of Electronic & Electrical Engineering (Leeds) > Institute of Microwaves and Photonics (Leeds)
Depositing User: Repository Officer
Date Deposited: 28 Mar 2006
Last Modified: 06 Jun 2014 07:46
Published Version: http://link.aip.org/link/JAPIAU/v97/p103106
Status: Published
Refereed: Yes
Identification Number: 10.1063/1.1900929
URI: http://eprints.whiterose.ac.uk/id/eprint/1118

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