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Cross-sections of commercially available (a) 125 μm and (b) 60 μm diameter sapphire fiber are shown; the grating structure inscribed in 150 μm diameter fibre is shown in (c); the corresponding multimode reflection response is shown by the red trace in (d); when using the single-mode field expander shown in (e), the single-mode reflection spectrum shown in green in (d) is obtained.
