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Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Vol. 30, Iss. 4 — Feb. 15, 2005
  • pp: 358–360

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

Ming-Yuan Cheng, Yu-Chung Chang, Almantas Galvanauskas, Pri Mamidipudi, Rupak Changkakoti, and Peter Gatchell  »View Author Affiliations


Optics Letters, Vol. 30, Issue 4, pp. 358-360 (2005)
http://dx.doi.org/10.1364/OL.30.000358


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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 M^2 = 25 from an uncoiled fiber to M^2 = 6.5 from a properly coiled fiber, with the corresponding reduction in number of propagating transverse modes from >or=200 to <or=20.

© 2005 Optical Society of America

OCIS Codes
(060.2320) Fiber optics and optical communications : Fiber optics amplifiers and oscillators
(140.3070) Lasers and laser optics : Infrared and far-infrared lasers

Citation
Ming-Yuan Cheng, Yu-Chung Chang, Almantas Galvanauskas, Pri Mamidipudi, Rupak Changkakoti, and Peter Gatchell, "High-energy and high-peak-power nanosecond pulse generation with beam quality control in 200-µm core highly multimode Yb-doped fiberamplifiers," Opt. Lett. 30, 358-360 (2005)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-30-4-358

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