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Tapered-beam expander for single-mode optical-fibre gap devices
K.P.Jedrzejewski, F.Martinez, J.D.Minelly, C.D.Hussey, F.P.Payne
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.
Electronics Letters (1986) Vol.22(2) pp.105-106
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