title: Self-mixing in multi-transverse mode semiconductor lasers: model and potential application to multi-parametric sensing.
abstract: A general model is proposed for a Vertical Cavity Surface Emitting Laser (VCSEL) with medium aspect ratio whose field profile can be described by a limited set of Gauss-Laguerre modes. The model is adapted to self-mixing schemes by supposing that the output beam is reinjected into the laser cavity by an external target mirror. We show that the self-mixing interferometric signal exhibits features peculiar of the spatial distribution of the emitted field and the target-reflected field and we suggest an applicative scheme that could be exploited for experimental displacement measurements. In particular, regimes of transverse mode-locking are found, where we propose an operational scheme for a sensor that can be used to simultaneously measure independent components of the target displacement like target translations along the optical axis (longitudinal axis) and target rotations in a plane orthogonal to the optical axis (transverse plane).
authors.affiliation: CNR-Istituto di Fotonica e Nanotecnologie UOS Bari, c/o Dipartimento di Fisica Interateneo, Via Amendola 173, 70126 Bari, Italy. lorenzo.columbo@fisica.uniba.it
authors.forename: L
authors.initials: L
authors.lastname: Columbo
authors.forename: M
authors.initials: M
authors.lastname: Brambilla
authors.forename: M
authors.initials: M
authors.lastname: Dabbicco
authors.forename: G
authors.initials: G
authors.lastname: Scamarcio
mesh_terms: D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007368:Interferometry / Q000295:instrumentation*; D054023:Lasers, Semiconductor; D014159:Transducers