A high collection efficiency spectroscopic cathodoluminescence (CL) system based on an in-line ellipsoidal mirror has been constructed for use on a Cambridge S25U scanning electron micruscope (SEM). It can be fitted to or removed from the SEM in about 30 minutes and re4uires no significant modification of the instrume11t. It can be used to obtain total CL 1111ages, monochromatic CL images or CL spectra with an ultimate spectral resolution of 1 nm. The system has been applied to the study of doped synthetic quartz crystals, opt i cal fibres and optical fibre preforms, and to yttrium alu1ninium garnet, bismuth silicon oxide and potassium tantalum niobate crystals . The CL technique has proved particu larly valuable in the study of quartz and his revealed a number of intere st ing features related to crystal growth . For optical fibres and their preforms CL provides a convenient method of monitoring the distribution of gennanium, used as a dopant to increase the refractive index in the core region of the fibre. KEY WORUS: cathodoluminescence, scanning electron microscope, spectroscopy, aluminium doped quartz, germanium doped quartz, optical fibre, bismuth silicon oxide, yttrium aluminium garnet, silica. *Address for Correspondence: AD Trigg GEC Research Limited, Hirst Researc h Centre, East Lane, Wembley, Middlesex, HA9 ?PP, UK Phone No: (01) 904-1262
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