3RD-ORDER NONLINEAR-OPTICAL PROPERTIES OF NEW BISDITHIAFULVENYL-SUBSTITUTED TETRATHIAFULVALENE

We measured the third-order susceptibilities chi(ijkl)([3]) of new bis dithiafulvenyl-substituted tetrathiafulvalene, using the degenerate fo ur-wave mixing method. From these measurements we deduced the values o f the second-order hyperpolarizabilities gamma and their molecular and electronic contributions. We compared the third-order optical propert ies of these new extended tetrathiafulvalene derivatives with the prop erties of acetylenic and ethylenic analogs of tetrathiafulvalene that we studied previously. All organic molecules studied here revealed lar ge third-order nonlinear optical hyperpolarizability. (C) 1998 Optical Society of America.