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A confocal microscope, illuminated with 476.5 nm light, has been used to observe fluorescence around 635 nm from a Pr3+ ZBLANP fibre for varying input powers The resulting images have been used to determine the dopant concentration distribution across the fibre. Nominally, the fibre has a 2.5 µm core uniformly doped with 1000 ppm praseodymium ions
© 2000 IEEE
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