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Experimental results on the realisation and spectral characterisation of Er-ZBLAN microspherical lasers at 1.56 µm are presented. The laser effect is obtained using the properties of whispering gallery modes and pumping at 1.48 µm. Multimode operation and a laser threshold as low as 600 µW have been observed.
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Lissillour et al. (2000) studied this question.
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