INVESTIGATION OF TETRABENZPORPHYRIN BY THE Z-SCAN TECHNIQUE

The nonlinear transmission of tetrabenzporphyrin dissolved in tetrahyd rofuran was measured with the Z-scan technique at 532 nm with nanoseco nd pulses. The excited-state absorption cross section, the excited-sta te refractive-index cross section, and the linear and nonlinear absorp tion contributing to a thermal index change have been determined. To o ur knowledge, the excited-state cross section and its effective ratio to the ground-state cross section are the largest values reported to d ate.