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Quantum-well intermixing for the control of second-order nonlinear effects in AlGaAs multiple-quantum-well waveguides
Optics Letters
|January 12, 2008
Summary
We demonstrate a new quasi-phase-matching technique in AlGaAs waveguides. Impurity-free vacancy disordering reduces nonlinear susceptibility, paving the way for efficient frequency conversion.
Area of Science:
- Materials Science
- Optoelectronics
- Nonlinear Optics
Background:
- AlGaAs multiple-quantum-well (MQW) waveguides are crucial for optoelectronic devices.
- Quasi-phase-matching (QPM) is essential for efficient nonlinear frequency conversion.
- Impurity-free vacancy disordering (IFVD) is a technique for modifying quantum well properties.
Purpose of the Study:
- To demonstrate the feasibility of a novel QPM technique in AlGaAs MQW waveguides.
- To investigate the impact of IFVD on nonlinear optical properties.
- To assess the potential for achieving efficient frequency conversion.
Main Methods:
- Experimental demonstration of a new QPM technique.
- Non-phase-matched second-harmonic-generation (SHG) measurements.
- Utilizing impurity-free vacancy disordering (IFVD) for quantum-well intermixing.
Main Results:
- IFVD resulted in a 17% reduction in nonlinear susceptibility (χ((2))(zxy)) to ~340 pm/V.
- Sub-half-bandgap excitation near 1.5 microm was used.
- Low intermixed waveguide losses were observed.
Conclusions:
- The IFVD process offers high spatial resolution for modifying AlGaAs MQW waveguides.
- Periodic intermixing along the propagation direction is feasible.
- This technique shows promise for achieving useful frequency-conversion efficiencies.
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