Abstract
Cascaded dual-wavelength lasing at 0.85 μm and 1.55 μm from an Er3+-doped ZBYA fluorozirconate glass microsphere is demonstrated for the first time. Two wavelengths corresponding to the transitions of Er3+: 4S3/2 → 4I13/2 and 4I13/2 → 4I15/2 are generated due to up-conversion and down-conversion processes respectively. Cascade lasing from ZBYA microsphere resonators with various Er3+ doping concentrations and diameters are experimentally studied by utilizing a 980 nm laser diode as the pump source. The influence of concentration and diameter on up-conversion and down-conversion lasers are investigated. The results indicate that Er3+-doped ZBYA fluorozirconate glass microspheres are promising candidates for practical applications requiring multi-wavelength micro-lasers and in optical communications.
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