All-fiber 7x1 signal combiner for incoherent laser beam combining

Danny Noordegraaf, Martin D. Maack, Peter M. W. Skovgaard, Jeppe Johansen, Frank Becker, Steffen Belke, Mats Blomqvist, Jesper Lægsgaard

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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.
Original languageEnglish
JournalProceedings of SPIE, the International Society for Optical Engineering
Pages (from-to)79142L
Publication statusPublished - 2011
EventFiber Lasers 8: Technology, Systems, and Applications - San Francisco, CA, United States
Duration: 24 Jan 201127 Jan 2011
Conference number: 8


ConferenceFiber Lasers 8
CountryUnited States
CitySan Francisco, CA

Bibliographical note

Copyright 2011 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.


  • Beam combining
  • Fiber lasers

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