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White laser covering the visible color spectrum is critical in variousapplications including vivid display, holographic imaging and light-basedversion of Wi-Fi, but it is still challenging to realize the white microlaserdue to the rigorous requirement in the balance between the optical gain and thefeedback at different wavelengths. Here, we employ Tm, Er and Yb ionscorporately for the upconversion white lasing in a single ultrahigh quality (Q)(up to 108) doped microcavity, where the thresholds of the red, green and bluelasers are about 90, 500 and 300 {\mu}W, respectively. To the best of ourknowledge, it is the first rare-earth elements based room-temperature,continuous-wave white microlaser, which exhibits relatively stable chromaticityover 180 minutes, making it possible for practical applications.

Room-temperature continuous-wave upconversion white microlaser in a rare-earth doped microcavity