Nonlinear optical characterization of a generalized Fibonacci optical superlattice

Nonlinear optical characterization in a generalized Fibonacci-type optical superlattice, which can be generated by the concurrent inflation rule A --> A(m)B and B --> A (where m=positive integer), has been studied both theore tically and experimentally. Quasi-phase-matched second-harmonicgeneration s pectrum and direct third-harmonic-generation with high efficiency have been measured in a LiTaO3 superlattice structure with m=2. Two different struct ures in real space have shown a similarity in reciprocal space. (C) 1999 Am erican Institute of Physics. [S0003-6951(99)02430-4].