title: Beam shaping in high-power broad-area quantum cascade lasers using optical feedback.
abstract: Broad-area quantum cascade lasers with high output powers are highly desirable sources for various applications including infrared countermeasures. However, such structures suffer from strongly deteriorated beam quality due to multimode behavior, diffraction of light and self-focusing. Quantum cascade lasers presenting high performances in terms of power and heat-load dissipation are reported and their response to a nonlinear control based on optical feedback is studied. Applying optical feedback enables to efficiently tailor its near-field beam profile. The different cavity modes are sequentially excited by shifting the feedback mirror angle. Further control of the near-field profile is demonstrated using spatial filtering. The impact of an inhomogeneous gain as well as the influence of the cavity width are investigated. Compared to existing technologies, that are complex and costly, beam shaping with optical feedback is a more flexible solution to obtain high-quality mid-infrared sources.
authors.affiliation: Thales Research &Technology, 1 avenue Augustin Fresnel, 91767 Palaiseau, France.|MirSense, Centre d'intégration NanoINNOV, 8 avenue de la Vauve, 91120 Palaiseau, France.|Laboratoire Pierre Aigrain, Ecole Normale Supérieure-PSL Research University, CNRS, Université Pierre et Marie Curie-Sorbonne Universités, Université Paris Diderot-Sorbonne Paris Cité, 24 rue Lhomond, 75231 Paris Cedex 05, France.
authors.forename: Simon
authors.initials: S
authors.lastname: Ferré
authors.affiliation: MirSense, Centre d'intégration NanoINNOV, 8 avenue de la Vauve, 91120 Palaiseau, France.|Université Paris-Saclay, Télécom ParisTech, 46 rue Barrault, 75013, Paris, France.
authors.forename: Louise
authors.initials: L
authors.lastname: Jumpertz
authors.affiliation: MirSense, Centre d'intégration NanoINNOV, 8 avenue de la Vauve, 91120 Palaiseau, France.
authors.forename: Mathieu
authors.initials: M
authors.lastname: Carras
authors.affiliation: Laboratoire Pierre Aigrain, Ecole Normale Supérieure-PSL Research University, CNRS, Université Pierre et Marie Curie-Sorbonne Universités, Université Paris Diderot-Sorbonne Paris Cité, 24 rue Lhomond, 75231 Paris Cedex 05, France.
authors.forename: Robson
authors.initials: R
authors.lastname: Ferreira
authors.affiliation: Université Paris-Saclay, Télécom ParisTech, 46 rue Barrault, 75013, Paris, France.|Center for High Technology Materials, University of New-Mexico, 1313 Goddard SE, Albuquerque, NM, United States.
authors.forename: Frédéric
authors.initials: F
authors.lastname: Grillot