Microcavity terahertz quantum-cascade laser

G. Fasching; A. Benz; R. Zobl; A. M. Andrews; T. Roch; W. Schrenk; G. Strasser; V. Tamosiunas; K. Unterrainer

doi:10.1117/12.630625

17 November 2005 Microcavity terahertz quantum-cascade laser

G. Fasching, A. Benz, R. Zobl, A. M. Andrews, T. Roch, W. Schrenk, G. Strasser, V. Tamosiunas, K. Unterrainer

Proceedings Volume 6010, Infrared to Terahertz Technologies for Health and the Environment; 601006 (2005) https://doi.org/10.1117/12.630625
Event: Optics East 2005, 2005, Boston, MA, United States

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/Al_0.15Ga_0.85As 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.

Citation Download Citation

G. Fasching, A. Benz, R. Zobl, A. M. Andrews, T. Roch, W. Schrenk, G. Strasser, V. Tamosiunas, and K. Unterrainer "Microcavity terahertz quantum-cascade laser", Proc. SPIE 6010, Infrared to Terahertz Technologies for Health and the Environment, 601006 (17 November 2005); https://doi.org/10.1117/12.630625

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