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Related Experiment Video

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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
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Optically pumped Milliwatt Whispering-Gallery microcavity laser.

Huiqi Li1, Zhaocong Wang1, Lei Wang1

  • 1School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan, China.

Light, Science & Applications
|September 11, 2023
PubMed
Summary
This summary is machine-generated.

Researchers developed a new solid-state whispering-gallery-mode laser achieving milliwatt emissions. This breakthrough overcomes previous limitations in output power and efficiency for compact microlasers.

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Area of Science:

  • Photonics and Laser Technology
  • Materials Science

Background:

  • Whispering-gallery-mode (WGM) microcavity lasers offer high Q factors and compact designs, crucial for microlaser development.
  • Previous solid-state WGM lasers faced challenges with low output power and optical conversion efficiency, limiting practical applications.

Purpose of the Study:

  • To achieve milliwatt-level laser emissions from a solid-state whispering-gallery-mode laser at 1.06 µm.
  • To enhance output power and optical conversion efficiency in WGM microcavity lasers.

Main Methods:

  • Fabrication of a 30 µm diameter WGM microcavity using a crystalline Neodymium-doped Yttrium Aluminum Garnet (Nd: YAG) thin film.
  • Utilized carbon-implantation enhanced etching for thin film preparation.
  • Designed an eccentric microcavity for efficient free-space pump light coupling and waveguide integration.

Main Results:

  • Demonstrated milliwatt laser emissions at 1.06 µm from the solid-state WGM microcavity.
  • Achieved a maximum output power of 1.12 mW and an optical conversion efficiency of 12.4%.
  • Integrated the microcavity with a waveguide, yielding single-wavelength emission with 0.5 mW output power and 6.18% optical conversion efficiency.

Conclusions:

  • Successfully developed a high-power, efficient solid-state whispering-gallery-mode laser.
  • The novel eccentric microcavity design facilitates efficient pumping and integration.
  • This advancement offers a promising solution for compact photonic sources.