CALCULATION OF PHASE-MATCHING ELECTROOPTICAL MODULATION OF SHG IN KTP

The electric field required to modulate type II SHG efficiency in KTP using the linear electro-optical effect is calculated. It is found tha t 16 kV/cm for the conversion 1.064 mum-->0.532 mum and 31.5 kV/cm for the conversion 1.32 mum-->0.66 mum, applied along the binary axis, al low a phase-mismatch equal to pi for a crystal length of 1 cm along th e phase-matching direction. From the general point of view, the requir ed electric field is expressed as function of the angular acceptance a nd of the electro-optical dispersion of the phase-matching direction. This treatment allows a well understanding of the respective contribut ions of the refractive indices and of the linear electro-optical coeff icients.