Poly(phenylacetylene) (PPA) and poly(p-methoxyphenylacetylene) (PMOPPA) were synthesized by catalytic polymerization of monosubstituted alkynes and were fully characterized by conventional techniques. Linear and third-order non-linear optical properties of polymers solutions were investigated at lambda = 780 nm using a Z-scan set-up equipped with a femtosecond laser source at different operating regimes. A high repetition rate (76 MHz) regime was used to measure the linear and non-linear absorption coefficients by means of thermooptical effects. Values of the linear and non-linear absorption coefficients were alpha = 4.9 x 10(-3) cm(-1) and beta = 1.1 x 10(-11) cm W-1 for PPA and alpha = 2 x 10(-2) cm(-1) and beta = 2.1 x 10(-10) cm W-1 for PMOPPA. Very low repetition rate (14 Hz) excitation was used to evidence the purely-optical non-linear refractive indexes, that were gamma = 6 x 10(-18) cm(2) W-1 and gamma = 11 x 0(-18) cm(2) W-1, respectively, for PPA and PMOPPA. (C) 2001 Elsevier Science B.V. All rights reserved.
Z-scan measurements of third-order optical non-linearities in poly(phenylacetylenes) / M., Falconieri; R., D'Amato; A., Furlani; Russo, Maria Vittoria. - In: SYNTHETIC METALS. - ISSN 0379-6779. - 124:1(2001), pp. 217-219. (Intervento presentato al convegno Spring Meeting of the European-Materials-Research-Society tenutosi a STRASBOURG, FRANCE nel MAY 29-JUN 02, 2000) [10.1016/s0379-6779(01)00455-6].
Z-scan measurements of third-order optical non-linearities in poly(phenylacetylenes)
RUSSO, Maria Vittoria
2001
Abstract
Poly(phenylacetylene) (PPA) and poly(p-methoxyphenylacetylene) (PMOPPA) were synthesized by catalytic polymerization of monosubstituted alkynes and were fully characterized by conventional techniques. Linear and third-order non-linear optical properties of polymers solutions were investigated at lambda = 780 nm using a Z-scan set-up equipped with a femtosecond laser source at different operating regimes. A high repetition rate (76 MHz) regime was used to measure the linear and non-linear absorption coefficients by means of thermooptical effects. Values of the linear and non-linear absorption coefficients were alpha = 4.9 x 10(-3) cm(-1) and beta = 1.1 x 10(-11) cm W-1 for PPA and alpha = 2 x 10(-2) cm(-1) and beta = 2.1 x 10(-10) cm W-1 for PMOPPA. Very low repetition rate (14 Hz) excitation was used to evidence the purely-optical non-linear refractive indexes, that were gamma = 6 x 10(-18) cm(2) W-1 and gamma = 11 x 0(-18) cm(2) W-1, respectively, for PPA and PMOPPA. (C) 2001 Elsevier Science B.V. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.