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Fig. 5


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Refractive (or phase) index n(λ) (solid line curve), and group index ng(λ) (dashed line curve) of silica. The tangent to the curve n(λ), at λ0, crosses the extended ordinate axis, where λ = 0 μm, at the value ng(λ0) of the group index for λ0, as shown for λ0 equal to 0.85 μm, or to 1.3 μm.

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