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3 April 2003 Red-shift due to pump intensity in Er:ZBLALiP whispering-gallery mode lasers
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A new kind of Erbium doped heavy fluoride glass Er:ZBLALiP has been studied. Microspheres were fabricated with this fluoride glass. Whispering Gallery Mode laser spectra around 1550 nm were analyzed for different sphere diameters and Erbium concentrations (from 0.01% to 0.2% by mole) under pumping by a fiber taper at 1480 nm. Red-shift effect on the frequencies of both fluorescence and laser spectra is experimentally observed when the pump power is increased, originating from thermal effects. A spectroscopic technique based on the green upconversion fluorescence is used to compute a loading effective temperature for the Er:ZBLALiP microsphere and this further allows us to calibrate the properties of the microsphere laser in terms of the thermal expansion as well as the variation of the refractive index.
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Patrice Féron, Zhiping Cai, Huiying Xu, Guy Michel Stephan, Philippe Goldner, and Michel Mortier "Red-shift due to pump intensity in Er:ZBLALiP whispering-gallery mode lasers", Proc. SPIE 4944, Integrated Optical Devices: Fabrication and Testing, (3 April 2003);

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