학술논문
Energy spectrum and thermal properties of a terahertz quantum-cascade laser based on the resonant-phonon depopulation scheme.
Document Type
Article
Author
Source
Subject
*MAGNETOCALORIC effects
*THERMAL properties
*TERAHERTZ spectroscopy
*SUBMILLIMETER waves
*PHONONS
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Language
ISSN
1063-7826
Abstract
The dependences of the electronic-level positions and transition oscillator strengths on an applied electric field are studied for a terahertz quantum-cascade laser (THz QCL) with the resonant-phonon depopulation scheme, based on a cascade consisting of three quantum wells. The electric-field strengths for two characteristic states of the THz QCL under study are calculated: (i) 'parasitic' current flow in the structure when the lasing threshold has not yet been reached; (ii) the lasing threshold is reached. Heat-transfer processes in the THz QCL under study are simulated to determine the optimum supply and cooling conditions. The conditions of thermocompression bonding of the laser ridge stripe with an n -GaAs conductive substrate based on Au-Au are selected to produce a mechanically stronger contact with a higher thermal conductivity. [ABSTRACT FROM AUTHOR]