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Title: High-energy and high-peak-power nanosecond pulse generation with beam quality control in 200-μm core highly multimode Yb-doped fiber amplifiers
Authors: Cheng, Ming-Yuan;Chang, Yu-Chung;Galvanauskas, Almantas;Mamidipudi, Pri;Changkakoti, Rupak;Gatchell, Peter
Contributors: 電機工程學系
Date: 2005-02
Issue Date: 2012-07-03T01:48:10Z
Publisher: Optical Society of America
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-mm-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.
Relation: Optics Letters, 30(4): 358-360
Appears in Collections:[Department and Graduate Institute of Electronic Engineering] Periodical Articles

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