High-energy and high-peak-power nanosecond pulse generation with beam quality control in 200-μm core highly multimode Yb-doped fiber amplifiers

Ming Yuan Cheng, Yu Chung Chang, Almantas Galvanauskas, Pri Mamidipudi, Rupak Changkakoti, Peter Gatchell

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Abstract

We explored high-energy and high-peak-power pulse generation in large-core multimode fiber amplifiers, achieving what is to our knowledge the highest reported energies, up to 82 mJ for 500-ns pulses, 27 mJ for 50-ns pulses, and 2.4-MW peak power for 4-ns pulses at 1064 nm, using 200-μm-diameter and 0.062-N.A. core Yb-doped double-clad fiber amplifiers. The highly multimode nature of the fiber core was mitigated by use of a coiling-induced mode-filtering effect to yield a significant improvement in output-beam quality from M2 = 25 from an uncoiled fiber to M2 = 6.5 from a properly coiled fiber, with the corresponding reduction in number of propagating transverse modes from ≥200 to ≤20.

Original languageEnglish
Pages (from-to)358-360
Number of pages3
JournalOptics Letters
Volume30
Issue number4
DOIs
Publication statusPublished - 2005 Feb 15

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All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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