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Efficient second-harmonic generation and modal dispersion effects in orientation-patterned GaAs waveguides.

M B Oron1, S Pearl, P Blau

  • 1Electro-Optics Division, Soreq Nuclear Research Center, Yavne 81800, Israel. oron@soreq.gov.il

Optics Letters
|August 19, 2010
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Efficient second-harmonic generation was achieved in orientation-patterned gallium arsenide waveguides. Researchers studied the influence of waveguide modes on the process, identifying distinct behaviors for TE and TM modes, leading to high conversion efficiency.

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Area of Science:

  • Nonlinear optics
  • Semiconductor device physics
  • Integrated photonics

Background:

  • Second-harmonic generation (SHG) is crucial for frequency conversion in optics.
  • Orientation-patterned gallium arsenide (OPGaAs) offers unique nonlinear optical properties.
  • Waveguide structures are essential for confining and enhancing light-matter interactions.

Purpose of the Study:

  • To demonstrate efficient second-harmonic conversion of 4 micrometer radiation using OPGaAs waveguides.
  • To experimentally determine the phase-matching characteristics for SHG in these waveguides.
  • To investigate the impact of different waveguide modes (TE and TM) on the SHG process and pump polarization dependence.

Main Methods:

  • Fabrication and characterization of OPGaAs waveguides.
  • Experimental setup for second-harmonic generation with 4 micrometer pump radiation.
  • Analysis of phase-matching curves and conversion efficiency.
  • Polarization-dependent measurements to distinguish between TE and TM mode contributions.

Main Results:

  • Demonstrated efficient second-harmonic conversion in OPGaAs waveguides.
  • Presented an experimentally corrected phase-matching curve.
  • Identified two distinct types of SHG related to TE and TM modes, each with unique pump polarization dependencies.
  • Achieved a normalized conversion efficiency of 21% W(-1), closely matching theoretical predictions.

Conclusions:

  • OPGaAs waveguides are effective for efficient second-harmonic generation.
  • Waveguide modes significantly influence the SHG process and its polarization dependence.
  • The experimental results validate theoretical models for SHG in patterned semiconductor waveguides.