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Proceedings Paper

All-fiber 7x1 signal combiner for incoherent laser beam combining
Author(s): D. Noordegraaf; M. D. Maack; P. M. W. Skovgaard; J. Johansen; F. Becker; S. Belke; M. Blomqvist; J. Laegsgaard
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Paper Abstract

We demonstrate an all-fiber 7x1 signal combiner for incoherent laser beam combining. This is a potential key component for reaching several kW of stabile laser output power. The combiner couples the output from 7 single-mode (SM) fiber lasers into a single multi-mode (MM) fiber. The input signal fibers have a core diameter of 17 μm and the output MM fiber has a core diameter of 100 μm. In a tapered section light gradually leaks out of the SM fibers and is captured by a surrounding fluorine-doped cladding. The combiner is tested up to 2.5 kW of combined output power and only a minor increase in device temperature is observed. At an intermediate power level of 600 W a beam parameter product (BPP) of 2.22 mm x mrad is measured, corresponding to an M2 value of 6.5. These values are approaching the theoretical limit dictated by brightness conservation.

Paper Details

Date Published: 11 February 2011
PDF: 7 pages
Proc. SPIE 7914, Fiber Lasers VIII: Technology, Systems, and Applications, 79142L (11 February 2011); doi: 10.1117/12.875078
Show Author Affiliations
D. Noordegraaf, NKT Photonics A/S (Denmark)
Technical Univ. of Denmark (Denmark)
M. D. Maack, NKT Photonics A/S (Denmark)
P. M. W. Skovgaard, NKT Photonics A/S (Denmark)
J. Johansen, NKT Photonics A/S (Denmark)
F. Becker, Rofin-Sinar Laser GmbH (Germany)
S. Belke, Rofin-Sinar Laser GmbH (Germany)
M. Blomqvist, Optoskand AB (Sweden)
J. Laegsgaard, Technical Univ. of Denmark (Denmark)


Published in SPIE Proceedings Vol. 7914:
Fiber Lasers VIII: Technology, Systems, and Applications
Jay W. Dawson, Editor(s)

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