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 ∼200‐fs 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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