Abstract

A recently reported technique for influencing the crystal packing of organic molecules possessing large hyperpolarizabilities has led to the discovery of a class of organic- salt complexes having large second-order susceptibilities (second-harmonic powder efficiencies 1000 times that of urea).¹ Head-to- tail packing of the nonlinear chromophores in sheets is frequently observed in this material system. In addition, nearly parallel orientation of nonlinear chromophores in adjacent sheets is possible by carefully choosing an appropriate counterion to function as a "spacer” between chromophore sheets.

© 1990 Optical Society of America