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Updated: Aug 24, 2026
Femtosecond Laser Filaments for Use in Sub-Diffraction-Limited Imaging and Remote Sensing
Published on: April 25, 2019
High power density beam from narrow diode-laser arrays in axial symmetry
Taito Alahautala1, Erkki Lassila, Rolf Hernberg
1Tampere University of Technology, Institute of Physics, Optics Laboratory, P.O. Box 692, FIN-33101 Tampere, Finland.
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.
