Affiliation: | Astronomical Instrumentation Group, Department of Physics, University of Durham, South Road, Durham DH1 3LE;The Technology Partnership, Melbourn Science Park, Cambridge Road, Melbourn, Royston, Hertfordshire SG8 6EE;Netherlands Foundation for Research in Astronomy, PO Box 2, 7990 AA Dwingeloo, the Netherlands;Photonics Group, Blackett Laboratory, Imperial College, London SW7 2BW |