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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 33,
  • Issue 20,
  • pp. 4297-4302
  • (2015)

High-Brightness Incoherent Combination of Fiber Lasers in 7 × 1 Fiber Couplers at Average Powers > 5 kW

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Abstract

We report on the experimental realization of two different low-loss single- to multimode fiber coupler designs, each combining more than 5 kW of output power. The adiabatic mode evolution in the seven-fiber input bundle provides a brightness close to its theoretical maximum. The all-glass structures exhibit very low heat loads mainly due to small avoidable contamination, indicating room for improvement. To the best of our knowledge, regarding all-fiber geometrical combined power generation, beam quality and heat stability, the presented results had never been reported before.

© 2015 IEEE

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