Abstract

We report efficient second-harmonic generation of femtosecond pulses in birefringently phase-matched GaAs/Al2O3 waveguides pumped at 2.01 μm. By use of pump pulses of 200fs duration and type I interaction, practical second-harmonic average powers of up to 650 μW were obtained, with an average input power of 50 mW. Waveguides of four different widths and two different lengths were investigated, and a normalized conversion efficiency of greater than 1000%W-1cm-2 was obtained for a 1-mm waveguide. Measurements of pump and second-harmonic spectra provided clear evidence of phase matching and depletion of the pump spectrum. The measured bandwidth of the second harmonic was 1.3 nm. From the measurements of transmitted pump power at the phase-matching wavelength, pump depletions of more than 80% were recorded.

© 2001 Optical Society of America

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