Abstract

Phase matching in a multilayer AlGaAs waveguide is used to generate mid-IR (7.5–8.5 μm) light through difference frequency generation (DFG) between a 1550 nm pump and 1950 nm signal. This represents the longest wavelength generated through DFG in a 2D waveguide mode in a semiconductor waveguide. It was produced with an efficiency of $1.2\times {10}^{-4}\%/\mathrm{W}$ in a 1 mm long sample. The process is shown to be tunable across $>2\mathrm{\mu m}$ through appropriate tuning of the input pump and signal wavelengths and/or waveguide geometry, and is therefore a viable platform for monolithic, tunable, mid-IR sources.

© 2013 Optical Society of America

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