1Istituto di Fotonica e Nanotecnologie (Italy) 2Lab. d'optronique, CNRS, ENSSAT (France) 3Nello Carrara Institute of Applied Physics (Italy) 4CNR (Italy)
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μA simple method based on the sol-gel technology has been developed to coat passive microspheres with an active
coating. The microspheres were prepared by fusion of a standard telecom fiber with a dimension of about 200 μm and
400 μm and have been respectively dipped in a 70SiO2-30HfO2 sol activated by 1 mol% and 0.1 mol% of erbium
ions. Here we first report about the luminescence properties of a silica-hafnia coating doped with erbium ions and then
whispering gallery mode spectra were analysed for different sphere diameters, thickness of coating and erbium
concentration. The thickness of the coating has been chosen in order to support at least one whispering gallery mode at
1.5 μm.
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Y. Jestin, C. Armellini, A. Chiappini, A. Chiasera, Y. Dumeige, M. Ferrari, P. Féron, L. Ghisa, G. Nunzi Conti, S. Trebaol, G. C. Righini, "Photonic properties of erbium activated coated microspheres," Proc. SPIE 6890, Optical Components and Materials V, 689008 (13 February 2008); https://doi.org/10.1117/12.762916