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Cladding pumped Ytterbium-doped fiber laser with holey inner and outer cladding

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Abstract

We have fabricated an ytterbium doped all-glass double-clad large mode area holey fiber. A highly efficient cladding pumped single transverse mode holey fiber laser has been demonstrated, allowing continuous-wave output powers in excess of 1W with efficiencies of more than 80%. Furthermore both Q-switched and mode-locked operation of the laser have been demonstrated.

©2001 Optical Society of America

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Figures (5)

Figure 1.
Figure 1. The refractive index profile of the ytterbium doped LMA fiber preform, from which the doped core (surrounded by the dotted lines) was extracted.
Figure 2.
Figure 2. SEM photograph of the air-clad ytterbium doped HF.
Figure 3.
Figure 3. Optimum parameter regime for doped LMA HF (Λ=10µm, λ=1.06µm). The doped core does not significantly influence the guidance for structures located under the solid line (Eq.2) and structures under the dashed line are SM (Eq.1). The diamond indicates the fiber from Fig.2.
Figure 4.
Figure 4. The CW laser outputs for (a) 976nm [circles] and (b) 915nm [squares] pump.
Figure 5.
Figure 5. Tuning curve obtained for a pump power of 1.33W.

Equations (2)

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V = 2 π ρ λ NA = 2 π ρ λ ( n silica + Δ n ) 2 n cl 2 ( λ )
Δ n < n silica 2 n eff 2 ( λ ) 2 n silica
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