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Proceedings Paper

Microcavity terahertz quantum-cascade laser
Author(s): G. Fasching; A. Benz; R. Zobl; A. M. Andrews; T. Roch; W. Schrenk; G. Strasser; V. Tamosiunas; K. Unterrainer
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Paper Abstract

We report the realization of microdisk and microring quantum-cascade lasers (QCLs) emitting in the terahertz (THz) region between 3.0 THz and 3.8 THz. The GaAs/Al0.15Ga0.85As heterostructure is based on longitudinal-optical phonon scattering for depopulation of the lower radiative state. A double metal waveguide is used to confine the whispering gallery modes in the gain medium. The threshold current density is 900 A/cm2 at 5 K. Lasing takes place in pulsed-mode operation up to a heat-sink temperature of 140 K. Finite-Difference Time-Domaine (FDTD) simulations were performed in a strong field limit to obtain the field distribution within a microdisk THz QCL resonator.

Paper Details

Date Published: 17 November 2005
PDF: 11 pages
Proc. SPIE 6010, Infrared to Terahertz Technologies for Health and the Environment, 601006 (17 November 2005); doi: 10.1117/12.630625
Show Author Affiliations
G. Fasching, Vienna Univ. of Technology (Austria)
A. Benz, Vienna Univ. of Technology (Austria)
R. Zobl, Vienna Univ. of Technology (Austria)
A. M. Andrews, Vienna Univ. of Technology (Austria)
T. Roch, Vienna Univ. of Technology (Austria)
W. Schrenk, Vienna Univ. of Technology (Austria)
G. Strasser, Vienna Univ. of Technology (Austria)
V. Tamosiunas, Semiconductor Physics Institute (Lithuania)
Vilnius Gediminas Technical Univ. (Lithuania)
K. Unterrainer, Vienna Univ. of Technology (Austria)

Published in SPIE Proceedings Vol. 6010:
Infrared to Terahertz Technologies for Health and the Environment
Alexey A. Belyanin; Rebekah A. Drezek; Claire F. Gmachl, Editor(s)

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