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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 13 — Jun. 20, 2011
  • pp: 12434–12439

Novel technique for mode selection in a multimode fiber laser

J. M. O. Daniel, J. S. P. Chan, J. W. Kim, J. K. Sahu, M. Ibsen, and W. A. Clarkson  »View Author Affiliations

Optics Express, Vol. 19, Issue 13, pp. 12434-12439 (2011)

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A simple technique for transverse mode selection in a large-mode-area (multimode) fiber laser is described. The technique exploits the different spectral responses of feedback elements based on a fiber Bragg grating and a volume Bragg grating to achieve wavelength-dependent mode filtering. This approach has been applied to a cladding-pumped thulium-doped fiber laser with a multimode core to achieve a single-spatial-mode output beam with a beam propagation factor (M2) of 1.05 at 1923 nm. Without mode selection the free-running fiber laser has a multimode output beam with an M2 parameter of 3.3. Selective excitation of higher order modes is also possible via the technique and preliminary results for laser oscillation on the LP11 mode are also discussed along with the prospects for scaling to higher power levels.

© 2011 OSA

OCIS Codes
(060.2430) Fiber optics and optical communications : Fibers, single-mode
(140.3510) Lasers and laser optics : Lasers, fiber

ToC Category:
Lasers and Laser Optics

Original Manuscript: March 9, 2011
Revised Manuscript: April 5, 2011
Manuscript Accepted: April 6, 2011
Published: June 13, 2011

J. M. O. Daniel, J. S. P. Chan, J. W. Kim, J. K. Sahu, M. Ibsen, and W. A. Clarkson, "Novel technique for mode selection in a multimode fiber laser," Opt. Express 19, 12434-12439 (2011)

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