title: High power density beam from narrow diode-laser arrays in axial symmetry.
abstract: A multiplexing method based on narrow diode-laser arrays (DLAs) in an axially symmetric configuration is described. The use of submillimeter narrow DLAs improves beam quality considerably in the slow-axis direction compared with typical 1-cm-wide DLAs. The axially symmetric geometry is advantageous for efficient spatial, wavelength, and polarization multiplexing. With narrow DLAs and an axially symmetric geometry, a small circular focus with more than 10-kW/mm2 average power density is possible. Theoretical calculations and preliminary experimental results are presented.
authors.affiliation: Tampere University of Technology, Institute of Physics, Optics Laboratory, P.O. Box 692, FIN-33101 Tampere, Finland.
authors.forename: Taito
authors.initials: T
authors.lastname: Alahautala
authors.forename: Erkki
authors.initials: E
authors.lastname: Lassila
authors.forename: Rolf
authors.initials: R
authors.lastname: Hernberg