It is found that both effects of saturable absorption and reverse saturable absorption are obtained with a solution of subphthalocyanine 2 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.
Nonlinear optical effects related to saturable and reverse saturable absorption by subphthalocyanines at 532 nm / Dini, Danilo; Sergej, Vagin; Michael, Hanack; Vincenzo, Amendola; Moreno, Meneghetti. - In: CHEMICAL COMMUNICATIONS. - ISSN 1359-7345. - 30(2005), pp. 3796-3798. [10.1039/b502359a]
Nonlinear optical effects related to saturable and reverse saturable absorption by subphthalocyanines at 532 nm
DINI, DANILO;
2005
Abstract
It is found that both effects of saturable absorption and reverse saturable absorption are obtained with a solution of subphthalocyanine 2 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.