Current Optics and Photonics

Optical Society of Korea (한국광학회)
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High-power Quasi-continuous Wave Operation of Incoherently Combined Yb-doped Fiber Lasers

  • Jeon, Minjee (Korea Institute of Industrial Technology) ;
  • Jung, Yeji (Korea Institute of Industrial Technology) ;
  • Park, Jongseon (Korea Institute of Industrial Technology) ;
  • Jeong, Hoon (Korea Institute of Industrial Technology) ;
  • Kim, Ji Won (Department of Applied Physics, Hanyang University ERICA) ;
  • Seo, Hongseok (Electronics and Telecommunications Research Institute)
  • Received : 2017.06.23
  • Accepted : 2017.08.04
  • Published : 2017.10.25
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Abstract

High-energy, high-power, quasi-continuous wave (QCW) operation of double-clad Yb fiber lasers incorporating an incoherent signal combiner is reported. We constructed four efficient, high-power Yb fiber lasers, each of which produced rectangular pulses at 1080 nm with a pulse energy greater than 15 J, and a pulse duration of 10 ms at a repetition rate of 10 Hz, corresponding to an average power of over 150 W and a peak power of over 1.5 kW for ~200 W of incident pump power at 915 nm. These laser outputs were combined by a homemade incoherent fiber signal combiner with low loss, yielding a maximum peak power of ~6.0 kW in a beam with $M^2{\approx}12.5$. The detailed laser characteristics and prospects for further power scaling in QCW operation are discussed.

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References

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