Guha S, Kang K, Porter P, Roach J F, Remy D E, Aranda F J, Rao D V
Opt Lett. 1992 Feb 15;17(4):264-6. doi: 10.1364/ol.17.000264.
The third-order optical nonlinearities of two metallotetrabenzoporphyrins and a platinum poly-yne dissolved in tetrahydrofuran were measured by using picosecond and nanosecond laser pulses. The pulse-width-dependent measurements indicated that excited-state absorption was present in both classes of material along with non-resonant two-photon absorption.
