Second harmonic generation in a thin AlAs-GaAs multilayer structure with wave propagation in the plane of the layers

Abstract

Second harmonic generation was measured from a thin AlAs-GaAs single-crystal multilayer using a laser tunable from 1.9 to 2.2 μm as fundamental. Due to propagation effects in the multilayers, the index mismatch nTM(2ω)−nTE(ω), obtained from the coherence length oscillations, is smaller than for the corresponding alloy.