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.
|Journal||Proceedings of SPIE, the International Society for Optical Engineering|
|Publication status||Published - 2011|
|Event||Fiber Lasers 8: Technology, Systems, and Applications - San Francisco, CA, United States|
Duration: 24 Jan 2011 → 27 Jan 2011
Conference number: 8
|Conference||Fiber Lasers 8|
|City||San Francisco, CA|
|Period||24/01/2011 → 27/01/2011|
Bibliographical noteCopyright 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