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 . Periodic spatial modulation of the bulklike second-order susceptibility was achieved with quantum-well intermixing for which the group III vacancies were created by -ion implantation. A narrow second-harmonic bandwidth of (FWHM) with an average power of was detected, corresponding to an internal conversion efficiency of , which was considerably limited by the spectral bandwidth of the fundamental.
© 2003 Optical Society of America
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