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Optical frequency conversion in silica-whispering-gallery-mode microspherical resonators.

D Farnesi1, A Barucci2, G C Righini1

  • 1IFAC-CNR Institute of Applied Physics "N. Carrara", Miplab, Via Madonna del Piano 10, 50019 Sesto Fiorentino (FI), Italy and Centro Studi e Ricerche "E. Fermi", P. Del Viminale 2, 00184 Rome, Italy.

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Summary

High quality factor whispering-gallery-mode microresonators enable nonlinear optical interactions. Researchers achieved tunable, room temperature, continuous-wave multicolor emission in silica microspheres for efficient frequency conversion.

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Area of Science:

  • Nonlinear optics
  • Photonics
  • Materials science

Background:

  • Whispering-gallery-mode (WGM) microresonators possess high quality factors, making them excellent platforms for nonlinear optical processes.
  • Silica microspheres are a promising material for fabricating WGM microresonators due to their optical properties.

Purpose of the Study:

  • To analyze third-order nonlinear optical interactions (χ((3))) in silica microspheres.
  • To achieve tunable, room temperature, continuous-wave (cw) multicolor emission in WGM microresonators.

Main Methods:

  • Experimental and theoretical analysis of third harmonic generation (THG).
  • Investigation of Raman-assisted third-order sum-frequency generation (SFG).
  • Control of cavity mode dispersion and excitation of nonequatorial modes.

Main Results:

  • Demonstration of efficient frequency conversion in silica microspheres.
  • Achieved tunable, room temperature, cw multicolor emission.
  • Successful implementation of THG and Raman-assisted SFG in the visible spectrum.

Conclusions:

  • Silica microspherical WGM microresonators are highly effective for nonlinear optical applications.
  • Controlling mode dispersion and exciting nonequatorial modes are key for efficient frequency conversion.
  • The study paves the way for novel light sources and optical signal processing.