Abstract

We report on the laser properties of multicore photonic crystal fiber lasers. A stable phase locking of six- and seven-core structures through evanescent coupling is observed. Effective supermode selection is obtained by using both diffraction losses and the Talbot effect. A pure in-phase supermode is obtained (1.1 times diffraction limited). The laser operating in this mode has a slope efficiency of 70% with up to 44W of output power. The modal area of the in-phase supermode multicore fiber is 1150μm2, which makes it, to our knowledge, the single-mode fiber laser with the largest mode field area. In-phase laser action is stable when the fiber is bent.

© 2005 Optical Society of America

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[CrossRef]

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[CrossRef]

IEEE Photonics Technol. Lett.

R. J. Beach, M. D. Feit, S. C. Mitchell, K. P. Cutter, S. A. Payne, R. W. Mead, J. S. Hayden, D. Krashkevich, and D. A. Alunni, IEEE Photonics Technol. Lett. 15, 670 (2003).
[CrossRef]

J. Mod. Opt. A

P. J. Roberts and T. J. Shepherd, J. Mod. Opt. A 3, 133 (2001).
[CrossRef]

J. Opt. Soc. Am. B

Opt. Commun.

I. M. Beldyugin, M. V. Zolotarev, and I. V. Shinkareva, Opt. Commun. 85, 338 (1991).
[CrossRef]

Opt. Express

Opt. Lett.

Phys. Rev. A

R.-D. Li and T. Erneux, Phys. Rev. A 46, 4252 (1992).
[CrossRef] [PubMed]

Proc. SPIE

L. Michaille, C. H. Bennett, and T. J. Shepherd, Proc. SPIE5335, 170 (2004).
[CrossRef]

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Figures (4)

Fig. 1
Fig. 1

Scanning electron microscope image of a cross section of the six-core structure. The distance between the cores is 20 μ m .

Fig. 2
Fig. 2

(a) CCD image of the end face of the lasing six-core structure, (b) far-field image just below threshold, (c) far-field image just above threshold showing phase locking. For (b) and (c), the full axis range is 120 mrad .

Fig. 3
Fig. 3

Experimental far-field CCD images obtained for (a) 2 z = 0.1 mm , (b) 2 z = 1 mm , and (c) 2 z = 2 mm . Theoretical far-field intensity profile of (d) the antiphase, (e) the n = 1 , 5 , and (f) the in-phase supermodes. The full axis range is 120 mrad .

Fig. 4
Fig. 4

Plot of γ n for each supermode of the six-core ring: the in-phase (circles), the antiphase (crosses), the n = 1 , 5 (triangles), and the n = 2 , 4 (squares) supermodes. The field diameter of each core field is 14 μ m and the core separation is 20 μ m .

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