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AlGaAs guided-wave second-harmonic generation at 2.23 μm from a quantum cascade laser
Applied Optics
|October 17, 2014
Summary
We achieved frequency doubling of a quantum cascade laser using a GaAs/AlOx waveguide. This generates second harmonic light between 2.2-2.4 μm, a wavelength range with limited semiconductor sources.
Area of Science:
- Optoelectronics
- Semiconductor devices
- Nonlinear optics
Background:
- Quantum cascade lasers (QCLs) are crucial for mid-infrared applications.
- Efficient frequency conversion in semiconductor waveguides is challenging.
- Limited availability of semiconductor sources in the 2.2-2.4 μm range.
Purpose of the Study:
- To demonstrate frequency doubling of a QCL.
- To utilize a multilayered, partially oxidized GaAs/AlOx waveguide for second harmonic generation (SHG).
- To explore parameters affecting SHG efficiency for practical implementation.
Main Methods:
- Fabrication of a multilayered, partially oxidized GaAs/AlOx waveguide.
- Utilizing waveguide width for phase-matching the SHG process.
- Characterization of generated second harmonic light in the 2.2-2.4 μm range.
Main Results:
- Successful frequency doubling of a QCL was demonstrated.
- Second harmonic generation achieved in the 2.2-2.4 μm wavelength range.
- Analysis of fabrication and experimental parameters influencing conversion efficiency.
Conclusions:
- The study presents a viable method for generating light in an under-served spectral region using semiconductor technology.
- The developed GaAs/AlOx waveguide is a promising platform for efficient nonlinear frequency conversion.
- Further optimization of parameters can lead to practical semiconductor-based light sources for the mid-infrared.
