Beam patterns of terahertz quantum cascade lasers with subwavelength cavity dimensions

Journal article (2006)
Department
Kavli Institute of Nanoscience (AS) (TU Delft)
Copyright: © 2006 The Author(s); American Institute of Physics
DOI: https://doi.org/doi:10.1063/1.2194889
Quantum cascade lasers Submillimetre wave lasers Laser beams Laser cavity resonators Light coherence Laser modes
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Published Date

12-04-2006

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Source:

Applied Physics Letters, 88 (15), 2006

ISSN:

0003-6951

ISBN:

0003-6951

Source:

http://link.aip.org/link/APPLAB/v88/i15/p151105/s1

Faculty

Applied Sciences

Department

Kavli Institute of Nanoscience

Abstract

The need to reach single-mode lasing and minimize at the same time the electrical dissipation of cryogenically operated terahertz quantum cascade lasers may result in small and subwavelength cavity dimensions. To assess the influence of such dimensions on the shape of the laser emission, we have measured the beam pattern of two metal-metal cavity quantum cascade lasers. The patterns show regular angular intensity variations which depend on the length of the laser cavity. The physical origin of these features is discussed in terms of interference of the coherent radiation emitted by end and side facets of the laser bar.

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