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/mm<sup>2</sup> average power density is possible. Theoretical calculations and preliminary experimental results are presented.
© 2004 Optical Society of America
(060.4230) Fiber optics and optical communications : Multiplexing
(140.2010) Lasers and laser optics : Diode laser arrays
(140.3300) Lasers and laser optics : Laser beam shaping
(140.3390) Lasers and laser optics : Laser materials processing
Taito Alahautala, Erkki Lassila, and Rolf Hernberg, "High Power Density Beam from Narrow Diode-Laser Arrays in Axial Symmetry," Appl. Opt. 43, 2760-2766 (2004)