Quantum dot cascade heterostructure based on in-plane dipole moments for unipolar infrared cascade lasers

Mathilde Gobet; Dennis G. Deppe

doi:10.1117/12.609709

1 June 2005 Quantum dot cascade heterostructure based on in-plane dipole moments for unipolar infrared cascade lasers

Mathilde Gobet, Dennis G. Deppe

Proceedings Volume 5792, Laser Source and System Technology for Defense and Security; (2005) https://doi.org/10.1117/12.609709
Event: Defense and Security, 2005, Orlando, Florida, United States

Abstract

Quantum cascade lasers based on planar quantum wells have emerged as a leading candidate for infrared laser sources. However, these lasers are ultimately limited by phonon emission, and exhibit useful optical gain only for the tranverse magnetic polarization. Quantum dot (QD) gain material to replace the planar gain regions is very attractive because the unipolar approach can then lead to both a phonon bottleneck, and surface emission. However, tunneling phenomenon is quite different for unipolar QD injection, and designs that follow the now standard approaches based on planar quantum wells are known to have unfavorable tunneling characteristics. In this paper we present a new device design based on QDs that can lead to important advantages for realizing high performance unipolar injection infrared lasers. The new quantum dot cascade laser design is based on controlling electron tunneling in the different quantum dimensional systems, from zero-dimensional to two-dimensional, to both block as well as enhance tunneling in a gain stage so as to obtain the population inversion necessary for infrared gain. This new device, the quantum dot cascade laser (QDCL), can operate with a phonon bottleneck, and therefore can exhibit improved high temperature performance in contrast to planar heterostructure unipolar devices. In addition, the zero-dimensional confinement can also provide transverse electric polarization in the radiation field, and therefore surface emission. Epitaxial growth experiments based on self-organized quantum dots to realize the new QDCL approach are presented and discussed.

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Mathilde Gobet and Dennis G. Deppe "Quantum dot cascade heterostructure based on in-plane dipole moments for unipolar infrared cascade lasers", Proc. SPIE 5792, Laser Source and System Technology for Defense and Security, (1 June 2005); https://doi.org/10.1117/12.609709

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KEYWORDS

Quantum cascade lasers

Quantum dots

Quantum wells

Heterojunctions

Phonons

Superlattices

Infrared lasers

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