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Second-harmonic generation from a first-order quasi-phase-matched GaAs/AlGaAs waveguide crystal
Optics Letters
|December 7, 2007
Summary
Researchers achieved efficient second-harmonic generation using a novel quasi-phase matching technique in a semiconductor waveguide. This method utilizes periodic susceptibility modulation for enhanced nonlinear optical processes.
Area of Science:
- Nonlinear optics
- Semiconductor physics
- Materials science
Background:
- Second-harmonic generation (SHG) is crucial for frequency conversion in optics.
- Quasi-phase matching (QPM) is essential for efficient SHG in quasi-neutral nonlinear crystals.
- Achieving first-order QPM in semiconductor waveguides presents unique challenges.
Purpose of the Study:
- To demonstrate a novel methodology for first-order QPM in semiconductor waveguides.
- To achieve efficient second-harmonic generation (SHG) using this new technique.
- To leverage the nonlinear optical properties of GaAs and AlxGa1-xAs.
Main Methods:
- Periodic modulation of the nonlinear susceptibility coefficient along the light propagation direction.
- Utilizing the difference in second-order nonlinear susceptibility (χ(2)) between GaAs and AlxGa1-xAs.
- Fabricating a semiconductor waveguide crystal with a nonuniform domain dimension (duty cycle ~39/61).
Main Results:
- Demonstrated efficient second-harmonic generation (SHG) at 975 nm from a 1950 nm pump wavelength.
- Successfully implemented first-order quasi-phase matching (QPM) in a semiconductor waveguide.
- Validated the novel methodology for nonlinear frequency conversion in tailored semiconductor structures.
Conclusions:
- The novel susceptibility modulation technique enables efficient SHG in semiconductor waveguides.
- This approach overcomes previous limitations in achieving QPM in such materials.
- The demonstrated method opens new avenues for integrated nonlinear photonic devices.
