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A simple practical and controllable beam expander can be constructed from a single-mode optical fibre which has been overjacketed in a capillary of lower refractive index and then tapered. The properties of such an expanded beam in a gap device are also investigated.
Inspec keywords: optical waveguide components; optical losses; optical fibres
Other keywords:
Subjects: Fibre optics; Fibre optics and fibre waveguides