title: Nonlinear optical effects related to saturable and reverse saturable absorption by subphthalocyanines at 532 nm.
abstract: It is found that both effects of saturable absorption and reverse saturable absorption are obtained with a solution of subphthalocyanine at 532 nm depending on the intensity of 9 ns laser pulses; saturable absorption occurs at lower intensity levels whereas the reverse effect prevails at higher levels; contrary to expectations, subphthalocyanines can behave as reverse saturable absorbers at 532 nm, despite the high linear absorption at this wavelength; data have been fitted with a five-level model which considers three consecutive electronic transitions with absorption cross-section values of 1.4 x 10(-16), 1.0 x 10(-16) and 40 x 10(-16) cm(2), respectively.
authors.affiliation: Institute of Organic Chemistry, University of Tübingen, Auf der Morgenstelle 18, D-72076 Tübingen, Germany. danilo.dini@uni-tuebingen.de
authors.forename: Danilo
authors.initials: D
authors.lastname: Dini
authors.forename: Sergej
authors.initials: S
authors.lastname: Vagin
authors.forename: Michael
authors.initials: M
authors.lastname: Hanack
authors.forename: Vincenzo
authors.initials: V
authors.lastname: Amendola
authors.forename: Moreno
authors.initials: M
authors.lastname: Meneghetti