Holographic lenses for use with optical fibre

The authors deal with the recording of 125 μm diameter holographic lenses in silver halide emulsion to operate in the 1200-1600 nm region, for optical fibre interconnect applications. Holographic materials are only sensitive to visible light. This requires that recording is at a different wavelength from replay. Lenses recorded at 514.5 nm were replayed at 1500 nm. Results of this replay have been given in the form of a scaled image of the focal region and an indication of the lenses efficiency in coupling light from one fibre into another