Physics

Optically pumped Milliwatt Whispering-Gallery microcavity laser

H. Li, Z. Wang, et al.

Discover the groundbreaking advancements in milliwatt laser emissions at 1.06 µm achieved by Huiqi Li and colleagues. This innovative work utilizes a solid-state whispering-gallery-mode laser with exceptional optical efficiency. The research paves the way for developing compact photonic sources, pushing the boundaries of laser technology.

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Abstract

This paper reports the achievement of milliwatt laser emissions at 1.06 µm from a solid-state whispering-gallery-mode (WGM) laser. A 30 µm diameter microcavity was fabricated using a crystalline Nd:YAG thin film, created via carbon-implantation enhanced etching. The laser achieved a maximum output power of 1.12 mW and an optical conversion efficiency of 12.4%. An eccentric microcavity design enabled efficient free-space pump light coupling, achieving 0.5 mW output power and 6.18% efficiency when integrated with a waveguide. This work advances solid-state WGM lasers for compact photonic sources.

Publisher

Light: Science & Applications

Published On

Jan 31, 2023

Authors

Huiqi Li, Zhaocong Wang, Lei Wang, Yang Tan, Feng Chen