Novel High Nonlinearity Organic Crystals

We will present the most recent results on the growth and characterization of novel high quality molecular crystals for nonlinear optics. These crystals are based on ionic or hydrogen bonding of new and known chromophores with large second-order hyperpolarizabilities. Detailed results of optical, electro-optical and nonlinear-optical properties of high quality and large size DAST crystals, of hydrazone derivatives and new co-crystals will be presented. It will be shown that optimized parallel alignment of chromophores as well as optimum structures for phase-matched frequency mixing have been realized. In addition, we report on the measurement of the highest known phase-matchable nonlinear susceptibility coefficient of 200 pm/v determined recently in our laboratory.