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Microlaser with multiple lasing bands is critical in various applications,such as full-colour display, optical communications and computing. Here, wepropose a simple and efficient method for homogeneously doping rare earthelements into a silica whispering-gallery-mode microcavity. By this method, wedemonstrate simultaneous and stable lasing covering ultraviolet, visible andnear-infrared bands in an ultrahigh-Q (exceeding 108) Er-Yb co-doped silicamicrosphere under room temperature and continuous-wave pump for the first time.The lasing thresholds of the 380, 410, 450, 560, 660, 800, 1080 and 1550nm-bands are estimated to be 380, 150, 2.5, 12, 0.17, 1.7, 10 and 38 {\mu}W,respectively, where the lasing in the 380, 410 and 450 nm-bands by Er elementhave not been separately demonstrated under room temperature andcontinuous-wave pump until this work. This ultrahigh-Q doped microcavity is anexcellent platform for high-performance multi-band microlasers,ultrahigh-precise sensors, optical memories and cavity-enhanced light-matterinteraction studies.

Simultaneous ultraviolet, visible and near-infrared continuous-wave lasing in a rare-earth-doped microcavity