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Shared and dual optical parametric generation in non linear photonic crystals of LiTaO3

We investigated specific common optical parametric generation (OPG) using a 532nm pump beam along the x axis of a square lattice two-dimensional periodically poled lithium tantalate (2D-PPLT). Twin-beam generation are observed with the signal or the idler beams propagating collinearly and the other OPG counterpart non-collinearly to the pump beam due to participation of reciprocal lattice vectors (RLV) of K1,±1. Multi-wavelength dual-beam generation are also observed due to contributions from K1,0 and K1,±1.