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Phase matching in monolithic Bragg reflection waveguides.

A S Helmy1, B Bijlani, P Abolghasem

  • 1Department of Electrical and Computer Engineering and Institute for Optical Sciences, University of Toronto, 10 King's College Road, Toronto, Ontario, Canada. a.helmy@utoronto.ca

Optics Letters
|August 19, 2007
PubMed
Summary

Researchers observed second-harmonic generation using Bragg reflection waveguides, achieving a notable enhancement in conversion efficiency. This marks a significant step in nonlinear optics and waveguide technology.

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Area of Science:

  • Nonlinear Optics
  • Integrated Photonics
  • Materials Science

Background:

  • Second-harmonic generation (SHG) is a key nonlinear optical process.
  • Bragg reflection waveguides offer unique light confinement properties.
  • Efficient SHG in waveguides is crucial for photonic device applications.

Purpose of the Study:

  • To demonstrate SHG using type I phase matching in Bragg reflection waveguides.
  • To investigate the nonlinear coefficient chi(xyz)((2))(d(14)).
  • To analyze the conversion efficiency and bandwidth of the generated second harmonic.

Main Methods:

  • Utilizing type I phase matching in engineered Bragg reflection waveguides.
  • Pumping the waveguide with a pulsed laser at 1587.8 nm (2 ps pulse width, 75.6 MHz repetition rate).

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  • Measuring the generated second-harmonic power and spectral bandwidth.

    • Main Results:

    • Observed second-harmonic generation with 0.7 microW power from 25.2 mW average pump power.
    • Achieved an order of magnitude enhancement in conversion efficiency for phase-matched conditions.
    • Measured a phase-matched conversion efficiency of 0.001% and a bandwidth of 0.43 nm.

    Conclusions:

    • First observation of SHG via type I phase matching in Bragg reflection waveguides.
    • Demonstrated the effectiveness of this waveguide structure for enhancing nonlinear optical processes.
    • Results align with theoretical predictions, validating the approach for photonic integration.