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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
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Full-color WGM lasing in nested microcavities.

Kun Ge1, Xiaoyu Shi1, Zhiyang Xu1

  • 1College of Physics and Optoelectronics, Faculty of Science, Beijing University of Technology, Beijing 100124, China. trzhai@bjut.edu.cn.

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|June 9, 2021
PubMed
Summary
This summary is machine-generated.

Researchers created a full-color whispering-gallery mode (WGM) laser using nested microcavities and light-emitting polymers. This novel WGM laser offers tunable, narrow-linewidth emission for potential use in compact lighting and white laser sources.

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Area of Science:

  • Photonics and Optical Engineering
  • Materials Science
  • Nanotechnology

Background:

  • Whispering-gallery mode (WGM) lasers are known for their high quality factors and narrow linewidths.
  • Achieving full-color emission and wavelength tunability in WGM lasers remains a challenge.
  • Nested microcavity designs offer potential for enhanced optical confinement and functionality.

Purpose of the Study:

  • To fabricate a full-color whispering-gallery mode (WGM) laser.
  • To achieve red-green-blue (RGB) lasing with tunable wavelengths.
  • To explore the potential applications of this WGM laser in compact lighting and white laser sources.

Main Methods:

  • Fabrication of a nested microcavity structure using partitioned light-emitting polymers.
  • Excitation of the microcavity with a nanosecond laser to induce WGM lasing.
  • Characterization of lasing properties, including color output, quality factor, linewidth, and tunability.

Main Results:

  • Successful fabrication of a full-color WGM laser emitting red, green, and blue light.
  • Achieved high quality factor (>10^4) and narrow linewidth (0.025 nm) WGM lasing.
  • Demonstrated wavelength tunability by altering the polymers within the nested microcavities.
  • Observed low excitation thresholds, mitigating fluorescence resonant energy transfer.

Conclusions:

  • A simple and effective method for fabricating full-color, tunable WGM lasers has been developed.
  • The nested microcavity design enhances laser performance and avoids fluorescence resonant energy transfer.
  • This technology holds promise for advanced applications in compact lighting and white laser generation.