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Area of Science:

  • Nonlinear Optics
  • Integrated Photonics
  • Materials Science

Background:

  • Supercontinuum generation is crucial for applications like metrology and sensing.
  • Integrated nonlinear waveguides offer advantages in nonlinearity, transparency, and cost.
  • Gallium phosphide (GaP) is explored for its nonlinear properties and optical transparency.

Purpose of the Study:

  • To investigate GaP as a platform for supercontinuum generation.
  • To demonstrate octave-spanning supercontinuum in a sub-millimeter GaP waveguide.
  • To analyze the nonlinear mechanisms and figure of merit in GaP waveguides.

Main Methods:

  • Fabrication of sub-millimeter GaP waveguides.
  • Excitation of waveguides with transversely magnetically polarized light.
  • Spectral characterization of the generated supercontinuum.

Main Results:

  • Octave-spanning, gap-free, and highly coherent supercontinuum generation achieved in GaP.
  • A record figure of merit of 43.56 THz/mm/kW reported for GaP in the normal dispersion regime.
  • Observation and analysis of multiple second harmonic generation mechanisms.

Conclusions:

  • GaP is a highly versatile material for broadband nonlinear photonics.
  • The GaP-on-isolator platform shows significant potential for advanced photonic applications.
  • This work establishes a new benchmark for integrated photonic platforms in nonlinear optics.