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WGM lasing in irregular cavities with arbitrary boundaries.

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  • 1College of Mechanical and Electronic Engineering, Beijing Polytechnic, Beijing 100176, China.

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Summary
This summary is machine-generated.

Researchers developed a simple drip-coating method to create irregular whispering-gallery-mode (WGM) cavities for lasers. This technique enables low-cost WGM laser fabrication, producing both single-mode and multi-WGM lasing outputs.

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Area of Science:

  • Photonics and Optical Engineering
  • Materials Science

Background:

  • Whispering-gallery-mode (WGM) cavities are known for their high Q value and limited light field mode.
  • Conventional fabrication methods for WGM cavities can be complex and costly.

Purpose of the Study:

  • To introduce a simple, rapid, low-cost, and manufacturing-free method for creating irregular WGM cavities.
  • To demonstrate the fabrication and lasing characteristics of WGM lasers using this novel technique.

Main Methods:

  • A drip-coating method was employed using polyvinyl alcohol (PVA) solution doped with rhodamine 6G.
  • Irregular cavities with arbitrary boundaries were formed on a high-reflection mirror.
  • The fabricated cavities were pumped with a 532 nm pulsed laser to induce lasing.

Main Results:

  • Single-mode and multi-WGM lasing were successfully obtained from the drip-coated irregular cavities.
  • Whispering-gallery modes were identified as vertical oscillation modes, relying on total internal reflection and mirror interface reflection.
  • The arbitrary boundaries of the cavities did not participate in the reflection mechanism.

Conclusions:

  • The drip-coating method offers a viable alternative for designing and fabricating WGM lasers.
  • The study elucidates the mechanisms behind single-mode (loss-gain) and multi-WGM lasing in irregular cavities.
  • This approach may open new avenues for the development of cost-effective WGM laser devices.