Electro-optically controlled efficiencies in a QPM coupled parametric process

We present a method for controlling the efficiencies of frequency doubling and frequency tripling in a QPM coupled parametric process based on the electro-optic effect. The numerically simulated results verify that this method is feasible and very efficient for controlling the energy exchange from the fundamental wave to the harmonic waves at any fundamental intensity. In terms of efficiencies controlled by the electro-optic effect, the asymmetric duty-cycle periodic structure is more reasonable than the symmetric one. In addition, we also show that electro-optic control is significantly better than temperature control.