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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Anthony J. Campillo
  • Vol. 31, Iss. 2 — Jan. 15, 2006
  • pp: 226–228

Efficient single-mode operation of a cladding-pumped ytterbium-doped helical-core fiber laser

P. Wang, L. J. Cooper, J. K. Sahu, and W. A. Clarkson  »View Author Affiliations


Optics Letters, Vol. 31, Issue 2, pp. 226-228 (2006)
http://dx.doi.org/10.1364/OL.31.000226


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Abstract

A novel approach to achieving robust single-spatial-mode operation of cladding-pumped fiber lasers with multimode cores is reported. The approach is based on the use of a fiber geometry in which the core has a helical trajectory within the inner cladding to suppress laser oscillation on higher-order modes. In a preliminary proof-of-principle study, efficient single-mode operation of a cladding-pumped ytterbium-doped helical-core fiber laser with a 30 μ m diameter core and a numerical aperture of 0.087 has been demonstrated. The laser yielded 60.4 W of output at 1043 nm in a beam with M 2 < 1.4 for 92.6 W launched pump power from a diode stack at 976 nm . The slope efficiency at pump powers well above threshold was 84 % , which compares favorably with the slope efficiencies achievable with conventional straight-core Yb-doped double-clad fiber lasers.

© 2006 Optical Society of America

OCIS Codes
(140.3480) Lasers and laser optics : Lasers, diode-pumped
(140.3510) Lasers and laser optics : Lasers, fiber
(140.3570) Lasers and laser optics : Lasers, single-mode

ToC Category:
Lasers and Laser Optics

Citation
P. Wang, L. J. Cooper, J. K. Sahu, and W. A. Clarkson, "Efficient single-mode operation of a cladding-pumped ytterbium-doped helical-core fiber laser," Opt. Lett. 31, 226-228 (2006)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-31-2-226

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