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  • Journal of Lightwave Technology
  • Vol. 38,
  • Issue 22,
  • pp. 6362-6370
  • (2020)

Breaking the Stringent Trade-Off Between Mode Area and NA for Efficient High-Power Fiber Lasers Around 2 μm

Deepak Jain, Jayanta K. Sahu, and Simon Fleming

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Abstract

We propose a novel approach of exploiting the LP02 mode in ultra-high NA confined-doped M-type fibers to ensure effective single-mode operation, thereby breaking the trade-off between mode-area scaling and ultra-high NA. This novel approach opens the door to highly rare-earth doped fibers suitable for power scaling applications. Therefore enabling, simultaneously scaling of power and slope efficiency of fiber lasers.

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