Abstract

An original architecture of an active fiber allowing a nearly diffraction-limited beam to be produced is demonstrated. The active medium is a double-clad large-mode-area photonic-bandgap fiber consisting of a 10,000ppm by weight Yb3+-doped core surrounded by an alternation of high- and low-index layers constituting a cylindrical photonic crystal. The periodic cladding allows the robust propagation of a 200μm2 fundamental mode and efficiently discriminates against the high-order modes. The M2 parameter was measured to be 1.17. A high-power cw laser was built exhibiting 80% slope efficiency above threshold. The robust propagation allows the fiber to be tightly bent. Weak incidence on the slope efficiency was observed with wounding radii as small as 6cm.

© 2008 Optical Society of America

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Blondy, J.-M.

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[CrossRef]

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Sudesh, V.

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[PubMed]

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[CrossRef]

Wang, P.

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Yeh, P.

Zheng, H.

P. Laperle, C. Paré, H. Zheng, and A. Croteau, Proc. SPIE 6453, 645308 (2007).
[CrossRef]

Electron. Lett.

S. Février, P. Viale, F. Gérôme, P. Leproux, P. Roy, J.-M. Blondy, B. Dussardier, and G. Monnom, Electron. Lett. 39, 1240 (2003).
[CrossRef]

J. Opt. Soc. Am.

Opt. Lett.

Proc. SPIE

P. Laperle, C. Paré, H. Zheng, and A. Croteau, Proc. SPIE 6453, 645308 (2007).
[CrossRef]

Other

V. Fomin, A. Mashkin, M. Abramov, A. Ferin, V. Gapontsev, and IPG Laser GmbH Burbach Germany, in International Symposium on High-Power Fiber Lasers and Their Applications (Laser Research Institute, 2006).

C.-H. Liu, G. Chang, N. Litchinister, D. Guertin, N. Jacobson, K. Tankala, and A. Galvanauskas, in Conference on Lasers and Electro-Optics/Quantum Electronics and Laser Science Conference and Photonic Applications Systems Technologies, OSA Technical Digest Series (CD) (Optical Society of America, 2007), paper CTuBB3.
[PubMed]

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Figures (3)

Fig. 1
Fig. 1

(a) Theoretical refractive index profile of solid-core bandgap fiber. The design space includes the core diameter D, the cladding index contrast Δ n , and the number N of bilayers. Also reported is an example of electric field distribution. (b) Attenuation coefficients computed when D = 20 μ m for various Δ n in the range (0.005, 0.01, 0.015, 0.02) as functions of N. Hollow symbols, LP 11 ; filled symbols, LP 01 .

Fig. 2
Fig. 2

Refractive index profile and computed electric field intensity distribution of considered bandgap fiber at 1064 nm . Inset, intensity distribution observed at the output of a 2 m long piece of fiber without pumping for various launching conditions. λ = 1.064 μ m .

Fig. 3
Fig. 3

Output power as a function of the launched pump power for the straight fiber. Inset, beam profile observed at the output end of the fiber. (a) R c = 7.5 cm , three turns; (b) R c = 2.5 cm , seven turns.

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