Abstract

We report type I second-harmonic generation by use of first-order quasi-phase matching in a GaAs/AlAs symmetric superlattice structure with femtosecond fundamental pulses at 1.55 µm. Periodic spatial modulation of the bulklike second-order susceptibility χzxy2 was achieved with quantum-well intermixing for which the group III vacancies were created by As+-ion implantation. A narrow second-harmonic bandwidth of 0.9 nm (FWHM) with an average power of 1.5 µW was detected, corresponding to an internal conversion efficiency of 0.06%, which was considerably limited by the spectral bandwidth of the fundamental.

© 2003 Optical Society of America

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