Open AccessThin-film filter wavelength-stabilized, grating combined, high-brightness kW-class direct diode laser
Author(s) -
Matthias Haas,
Simon Rauch,
Simon Nagel,
Lukas Irmler,
Thomas Dekorsy,
H. Zimer
Publication year - 2017
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.017657
Subject(s) - optics , materials science , laser beam quality , grating , beam parameter product , distributed feedback laser , laser , laser diode , optoelectronics , m squared , beam (structure) , diffraction grating , wavelength , diode , physics , laser beams
We report on kW-class dense wavelength beam combining of a laser diode module consisting of ten broad-area laser diode bars by using a novel multi-laser cavity approach based on a thin-film filter (TFF) as a dispersive optical element. The wavelength-stabilized output of the TFF cavity is beam combined upon a -1 st order transmission grating. Hereby, a cylindrical telescope is used for linear dispersion-matching between the TFF and the combiner grating. On the basis of simulations of the resulting beam quality deterioration, we are able to optimize the cavity and the combiner setup for optimal beam quality preservation. We demonstrate a highly efficient direct diode laser with 1.1-kW output power and a symmetrical beam parameter product of about 6mm × mrad (95 % power content) in both beam axis.