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American Institute of Physics, Applied Physics Letters, 15(88), p. 151105

DOI: 10.1063/1.2194889

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Beam patterns of terahertz quantum cascade lasers with subwavelength cavity dimensions

Journal article published in 2006 by A. J. L. Adam, I. Kašalynas, J. N. Hovenier, T. O. Klaassen, J. R. Gao, E. E. Orlova ORCID, B. S. Williams ORCID, S. Kumar, Q. Hu, J. L. Reno
This paper is available in a repository.
This paper is available in a repository.

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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.