We present what is, to the best of our knowledge, the first systematic study on how negative core–cladding index difference influences microstructured optical fiber’s modal behavior. Single-mode lasing has been realized for short-length cladding-pumped phosphate glass microstructured fibers with large depressed-index Er3+Yb3+-codoped cores.

© 2005 Optical Society of America

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2005 (2)

2004 (2)

2003 (3)

1997 (1)

1996 (1)

Atkin, D. M.

Birks, T. A.

Bouwmans, G.

Broeng, J.

Folkenberg, J. R.

Hansen, K. P.

Jakobsen, C.

Knight, J. C.

Koshiba, M.

Li, L.

Liem, A.

Limpert, J.

Mafi, A.

Moloney, J. V.

Morrell, M. M.

Mortensen, N. A.

Nielsen, M. D.

Nolte, S.

Percival, R. M.

Petersson, A.

Peyghambarian, N.

Qiu, T.

Reich, M.

Russell, P. St. J.

Saitoh, K.

Schreiber, T.

Schülzgen, A.

Simonsen, H. R.

Temyanko, V. L.

Tünnermann, A.

Wadsworth, W. J.

Wang, Q.

Zellmer, H.

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Figures (3)

Fig. 1
Fig. 1

Calculated fundamental mode distributions for MOF7s: Δ n = 7 × 10 4 , d AH Λ = 0.15 , with (a) three, (b) four, and (c) five rings of holes. All three MOF7s have the same ( 70 % ) confinement for the fundamental mode. (d) Comparison between a MOF7 and a MOF1 with the same core area demonstrates that the MOF1 demands a much larger physical size.

Fig. 2
Fig. 2

Measured M 2 values versus d AH Λ of MOF7s with three Δ n values. Inset, effect of annealing on MOF7s initially having Δ n = 7 × 10 4 .

Fig. 3
Fig. 3

Upper, calculated V eff of MOF7s with three Δ n values; lower, simulated (curves) and measured (dots) beam qualities for MOF7s with Δ n = 7 × 10 4 .

Equations (1)

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V eff = 2 π R λ n core 2 n FSM 2 ,