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

TL;DR

This paper demonstrates the first room-temperature, continuous-wave white microlaser using a rare-earth doped microcavity, capable of stable, full-spectrum visible light emission for practical applications.

Contribution

It introduces a novel rare-earth doped microcavity laser achieving stable white lasing at room temperature with ultrahigh quality, a significant advancement over previous technologies.

Findings

Achieved white lasing with thresholds of 90, 500, and 300 μW for red, green, and blue.

Demonstrated stable chromaticity over 180 minutes.

First to realize room-temperature, continuous-wave white microlaser with rare-earth elements.

Abstract

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