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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 46, Iss. 22 — Aug. 1, 2007
  • pp: 5009–5018

In-phase supermode selection in a multicore fiber laser array by means of a self-Fourier external cavity

Erik J. Bochove and Christopher J. Corcoran  »View Author Affiliations

Applied Optics, Vol. 46, Issue 22, pp. 5009-5018 (2007)

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A procedure is developed to determine the transverse-mode structure of a cavity consisting of a dense, evanescently coupled, waveguide laser array, which, in addition, is externally coupled by feedback from an external cavity. The formalism is used to determine the loss and phasing properties of a multicore fiber array coupled to an external self-Fourier cavity. Best performance is predicted for linear arrays of up to five cores, or two-dimensional arrays of up to 25 cores. A low-loss, in-phase, fundamental array mode is predicted, which achieves better than 30   dB discrimination against higher-order modes at periodically spaced values of the array length. However, we show that a shift in operating wavelength of typically a few nanometers can bring about near-perfect phasing and loss operation over a continuum of fiber lengths. With increased fill factor, significantly more of the output power can be concentrated in the central lobe of the far field but at the penalty of increased loss in the fundamental eigenmode.

© 2007 Optical Society of America

OCIS Codes
(070.2580) Fourier optics and signal processing : Paraxial wave optics
(070.6110) Fourier optics and signal processing : Spatial filtering
(140.3290) Lasers and laser optics : Laser arrays
(140.3410) Lasers and laser optics : Laser resonators
(140.3510) Lasers and laser optics : Lasers, fiber
(190.4370) Nonlinear optics : Nonlinear optics, fibers

ToC Category:
Lasers and Laser Optics

Original Manuscript: December 18, 2006
Revised Manuscript: April 4, 2007
Manuscript Accepted: April 4, 2007
Published: July 6, 2007

Erik J. Bochove and Christopher J. Corcoran, "In-phase supermode selection in a multicore fiber laser array by means of a self-Fourier external cavity," Appl. Opt. 46, 5009-5018 (2007)

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