Z-scan measurements of third-order optical non-linearities in poly(phenylacetylenes) |
| |
| Affiliation: | 1. ENEA-C.R. Casaccia, Div. Nuovi Materiali, via Anguillarese 301, 00060 Rome, Italy;2. Dip. Chimica, Università di Roma “La Sapienza”, P. A. Moro 5, 00185 Rome, Italy;1. Department of Chemistry, Faculty of Sciences, TarbiatModares University, Tehran, Iran;2. Institute of Physics of the ASCR, v.v.i., Na Slovance 2, 182 21 Praha 8, Czech Republic;1. “Gleb Wataghin” Institute of Physics (IFGW), University of Campinas (UNICAMP), 13083-859, Campinas, SP, Brazil;2. CCNH, Federal University of ABC (UFABC), 09210-580, Santo André, SP, Brazil;3. División Bajas Temperaturas, Centro Atómico Bariloche, Comisión Nacional de Energía Atómica, CONICET, Av Bustillo 9500, S.C. Bariloche, R8402AGP, Río Negro, Argentina;1. Laser Research Center, Vilnius University, Sauletekio ave. 10, Vilnius LT-10223, Lithuania;2. Light Conversion Ltd., Keramiku St. 2, LT-10223 Vilnius, Lithuania;1. Ecole normale supérieure, Bou Saada, cité Gaza BP 28001 Bousaada, M’sila, Algérie;2. Laboratoire de physique des matériaux et ses applications, université de M’sila, PB 116 Ichebilia – M’sila, 28200, Algérie;3. Univ Lyon, INSA-Lyon, LGEF, EA682, F-69621, VILLEURBANNE, FRANCE;4. IETR UMR CNRS 6164, Université de Nantes, 2 rue de la Houssinière, BP 92208, F-44322 Nantes cedex 3, France |
| |
| 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 λ=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 thermo-optical effects. Values of the linear and non-linear absorption coefficients were α=4.9×10?3 cm?1 and β=1.1×10?11 cm W?1 for PPA and α=2×10?2 cm?1 and β=2.1×10?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 γ=6×10?18 cm2 W?1 and γ=11×10?18 cm2 W?1, respectively, for PPA and PMOPPA. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
