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Published online by Cambridge University Press: 21 February 2011
The properties for members of a new class of nonlinear optical (NLO)materials which stoichiometrically incorporate organic and inorganicconstituents into a single crystalline lattice are reported. Recent resultsfor our synthetic, crystal growth, and optical studies suggest that a numberof these relatively transparent “semiorganic” compounds have significantsecond and/or third order NLO responses and often display favorable crystalgrowth morphologies.
The prototype material of this class, zinc tris(thiourea) sulfate, or ZTS,has a UV cutoff at about 325 nm, can be readily grown to cm3sizes, and has been shown to be a highly efficient Type II frequency doublerfor 1064 nm Nd:YAG laser radiation. ZTS also possesses a moderate thirdorder nonlinear optical response (ca. 0.1 × CS2) which occurs onat least a picosecond time scale as determined by degenerate four-wavemixing (DFWM) experiments at 532 nm.
Refractive index, second harmonic generation, and DFWM data for a number ofthese new compounds are presented.