Whispering-gallery-mode microcavity lasers possess remarkable characteristics such as high Q factors and compact geometries, making them an essential element in the evolution of microlasers. However, solid-state whispering-gallery-mode lasers have previously suffered from low output power and limited optical conversion efficiency, hindering their applications. Here, we present the achievement of milliwatt laser emissions at a wavelength of 1.06 µm from a solid-state whispering-gallery-mode laser. To accomplish this, we construct a whispering-gallery-mode microcavity (with a diameter of 30 µm) using a crystalline Nd: YAG thin film obtained through carbon-implantation enhanced etching of a Nd: YAG crystal. This microcavity laser demonstrates a maximum output power of 1.12 mW and an optical conversion efficiency of 12.4%. Moreover, our unique eccentric microcavity design enables efficient coupling of free-space pump light, facilitating integration with a waveguide. This integration allowed for single-wavelength laser emission from the waveguide, achieving an output power of 0.5 mW and an optical conversion efficiency of 6.18%. Our work opens up new possibilities for advancing solid-state whispering-gallery-mode lasers, providing a viable option for compact photonic sources.

回音壁模式微腔激光器具有高品质因数和紧凑的几何结构等显着特性，使其成为微激光器发展的重要元素。然而，固态回音壁模式激光器此前一直存在输出功率低、光学转换效率有限的问题，阻碍了其应用。在这里，我们展示了固态回音壁模式激光器在 1.06 µm 波长下实现毫瓦激光发射的成果。为了实现这一目标，我们使用通过 Nd:YAG 晶体的碳注入增强蚀刻获得的晶体 Nd:YAG 薄膜构建了回音壁模式微腔（直径为 30 µm）。该微腔激光器的最大输出功率为1.12 mW，光学转换效率为12.4%。此外，我们独特的偏心微腔设计可以实现自由空间泵浦光的有效耦合，从而促进与波导的集成。这种集成允许从波导发射单波长激光，实现 0.5 mW 的输出功率和 6.18% 的光学转换效率。我们的工作为推进固态回音壁模式激光器开辟了新的可能性，为紧凑光子源提供了可行的选择。