FLUENCE DEPENDENCE OF NONLINEAR-OPTICAL RESPONSE OF CADMIUM TEXAPHYRIN

Third-order nonlinear optical response of a cadmium texaphyrin solutio n at 532 nm was measured using time-resolved degenerate four-wave mixi ng with picosecond pulses. The molecules of cadmium texaphyrin exhibit a large optical nonlinearity, which arises from the excited-state pop ulation. The dynamics of the nonlinear optical response show an eviden t fluence dependence. The temporal response is characterized by three components, a slower, a faster, and a fastest, which are attributed to populations of the first triplet excited state, the first singlet exc ited state, and the higher singlet excited state, respectively. (C) 19 95 American Institute of Physics.