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 30μm diameter core and a numerical aperture of 0.087 has been demonstrated. The laser yielded 60.4W of output at 1043nm in a beam with M2<1.4 for 92.6W launched pump power from a diode stack at 976nm. 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

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References

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2004 (2)

Y. Jeong, J. K. Sahu, D. N. Payne, and J. Nilsson, Electron. Lett. 40, 470 (2004).
[CrossRef]

P. Wang, L. J. Cooper, W. A. Clarkson, J. Nilsson, R. B. Williams, J. Sahu, and A. K. Vogel, Electron. Lett. 40, 1325 (2004).
[CrossRef]

2003 (1)

J. Limpert, A. Liem, H. Zellmer, and A. Tunnermann, Electron. Lett. 39, 645 (2003).
[CrossRef]

2000 (1)

1976 (1)

Clarkson, W. A.

P. Wang, L. J. Cooper, W. A. Clarkson, J. Nilsson, R. B. Williams, J. Sahu, and A. K. Vogel, Electron. Lett. 40, 1325 (2004).
[CrossRef]

W. A. Clarkson, L. J. Cooper, P. Wang, R. B. Williams, and J. K. Sahu, in Advanced Solid-State Photonics, J.Zayhowski, ed., Vol. 83 of OSA Trends in Optics and Photonics Series (Optical Society of America, Washington, D.C., 2003), pp. 261-267.

Cooper, L. J.

P. Wang, L. J. Cooper, W. A. Clarkson, J. Nilsson, R. B. Williams, J. Sahu, and A. K. Vogel, Electron. Lett. 40, 1325 (2004).
[CrossRef]

W. A. Clarkson, L. J. Cooper, P. Wang, R. B. Williams, and J. K. Sahu, in Advanced Solid-State Photonics, J.Zayhowski, ed., Vol. 83 of OSA Trends in Optics and Photonics Series (Optical Society of America, Washington, D.C., 2003), pp. 261-267.

Goldberg, L.

Jeong, Y.

Y. Jeong, J. K. Sahu, D. N. Payne, and J. Nilsson, Electron. Lett. 40, 470 (2004).
[CrossRef]

Kliner, D. A. V.

Koplow, J. P.

Liem, A.

J. Limpert, A. Liem, H. Zellmer, and A. Tunnermann, Electron. Lett. 39, 645 (2003).
[CrossRef]

Limpert, J.

J. Limpert, A. Liem, H. Zellmer, and A. Tunnermann, Electron. Lett. 39, 645 (2003).
[CrossRef]

Marcuse, D.

Nilsson, J.

Y. Jeong, J. K. Sahu, D. N. Payne, and J. Nilsson, Electron. Lett. 40, 470 (2004).
[CrossRef]

P. Wang, L. J. Cooper, W. A. Clarkson, J. Nilsson, R. B. Williams, J. Sahu, and A. K. Vogel, Electron. Lett. 40, 1325 (2004).
[CrossRef]

Payne, D. N.

Y. Jeong, J. K. Sahu, D. N. Payne, and J. Nilsson, Electron. Lett. 40, 470 (2004).
[CrossRef]

Sahu, J.

P. Wang, L. J. Cooper, W. A. Clarkson, J. Nilsson, R. B. Williams, J. Sahu, and A. K. Vogel, Electron. Lett. 40, 1325 (2004).
[CrossRef]

Sahu, J. K.

Y. Jeong, J. K. Sahu, D. N. Payne, and J. Nilsson, Electron. Lett. 40, 470 (2004).
[CrossRef]

W. A. Clarkson, L. J. Cooper, P. Wang, R. B. Williams, and J. K. Sahu, in Advanced Solid-State Photonics, J.Zayhowski, ed., Vol. 83 of OSA Trends in Optics and Photonics Series (Optical Society of America, Washington, D.C., 2003), pp. 261-267.

Tunnermann, A.

J. Limpert, A. Liem, H. Zellmer, and A. Tunnermann, Electron. Lett. 39, 645 (2003).
[CrossRef]

Vogel, A. K.

P. Wang, L. J. Cooper, W. A. Clarkson, J. Nilsson, R. B. Williams, J. Sahu, and A. K. Vogel, Electron. Lett. 40, 1325 (2004).
[CrossRef]

Wang, P.

P. Wang, L. J. Cooper, W. A. Clarkson, J. Nilsson, R. B. Williams, J. Sahu, and A. K. Vogel, Electron. Lett. 40, 1325 (2004).
[CrossRef]

W. A. Clarkson, L. J. Cooper, P. Wang, R. B. Williams, and J. K. Sahu, in Advanced Solid-State Photonics, J.Zayhowski, ed., Vol. 83 of OSA Trends in Optics and Photonics Series (Optical Society of America, Washington, D.C., 2003), pp. 261-267.

Williams, R. B.

P. Wang, L. J. Cooper, W. A. Clarkson, J. Nilsson, R. B. Williams, J. Sahu, and A. K. Vogel, Electron. Lett. 40, 1325 (2004).
[CrossRef]

W. A. Clarkson, L. J. Cooper, P. Wang, R. B. Williams, and J. K. Sahu, in Advanced Solid-State Photonics, J.Zayhowski, ed., Vol. 83 of OSA Trends in Optics and Photonics Series (Optical Society of America, Washington, D.C., 2003), pp. 261-267.

Zellmer, H.

J. Limpert, A. Liem, H. Zellmer, and A. Tunnermann, Electron. Lett. 39, 645 (2003).
[CrossRef]

Electron. Lett. (3)

Y. Jeong, J. K. Sahu, D. N. Payne, and J. Nilsson, Electron. Lett. 40, 470 (2004).
[CrossRef]

J. Limpert, A. Liem, H. Zellmer, and A. Tunnermann, Electron. Lett. 39, 645 (2003).
[CrossRef]

P. Wang, L. J. Cooper, W. A. Clarkson, J. Nilsson, R. B. Williams, J. Sahu, and A. K. Vogel, Electron. Lett. 40, 1325 (2004).
[CrossRef]

J. Opt. Soc. Am. (1)

Opt. Lett. (1)

Other (1)

W. A. Clarkson, L. J. Cooper, P. Wang, R. B. Williams, and J. K. Sahu, in Advanced Solid-State Photonics, J.Zayhowski, ed., Vol. 83 of OSA Trends in Optics and Photonics Series (Optical Society of America, Washington, D.C., 2003), pp. 261-267.

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Figures (5)

Fig. 1
Fig. 1

Schematic diagram of a helical-core fiber.

Fig. 2
Fig. 2

Calculated propagation loss for the LP 01 and LP 11 modes versus pitch.

Fig. 3
Fig. 3

Cladding pumped Yb-doped helical-core fiber laser arrangement: T, transmission of the dichroic mirror.

Fig. 4
Fig. 4

(Color online) Beam propagation factor ( M 2 ) versus pitch at 10 W output power. a, Beam profile for an 8.5 mm pitch helical-core fiber laser; b, beam profile for a straight-core fiber laser.

Fig. 5
Fig. 5

Output power versus launched pump power for the 8.5 mm pitch helical-core fiber.

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