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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 14 — Jul. 9, 2007
  • pp: 8988–8996

Air-clad fibers: pump absorption assisted by chaotic wave dynamics?

Niels Asger Mortensen  »View Author Affiliations

Optics Express, Vol. 15, Issue 14, pp. 8988-8996 (2007)

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Wave chaos is a concept which has already proved its practical usefulness in design of double-clad fibers for cladding-pumped fiber lasers and fiber amplifiers. In general, classically chaotic geometries will favor strong pump absorption and we address the extent of chaotic wave dynamics in typical air-clad geometries. While air-clad structures supporting sup-wavelength convex air-glass interfaces (viewed from the high-index side) will promote chaotic dynamics we find guidance of regular whispering-gallery modes in air-clad structures resembling an overall cylindrical symmetry. Highly symmetric air-clad structures may thus suppress the pump-absorption efficiency η below the ergodic scaling law η ∝ Ac /A cl, where Ac and A cl are the areas of the rare-earth doped core and the cladding, respectively.

© 2007 Optical Society of America

OCIS Codes
(060.2280) Fiber optics and optical communications : Fiber design and fabrication
(060.2320) Fiber optics and optical communications : Fiber optics amplifiers and oscillators
(140.3510) Lasers and laser optics : Lasers, fiber

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: May 24, 2007
Manuscript Accepted: June 28, 2007
Published: July 5, 2007

Niels A. Mortensen, "Air-clad fibers: pump absorption assisted by chaotic wave dynamics?," Opt. Express 15, 8988-8996 (2007)

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