Two photon and one photon resonant third order nonlinear optical properties of Pi conjugated polymers英文电子书.pdf

Synthetic Metals 109 2000 79–83 locatesynmet Two-photon and one-photon resonant third-order nonlinear optical properties of -conjugated polymers Marek Samoc , Anna Samoc, Barry Luther-Davies Australian Photonics Cooperati e Research Centre, Laser Physics Centre, Research School of Physical Sciences and Engineering, Australian National Uniersity, Canberra 0200, Australia Received 26 June 1999; accepted 10 September 1999 Abstract Third-order nonlinear optical properties of a number of polymers with -electron conjugated structures have been investigated. For several polymers large negative refractive nonlinearities measured at 800 nm are accompanied by large two-photon absorption coefficients. Very strong nonlinear effects can be achieved in polymers showing linear absorption and absorption saturation effects at 800 nm, the examples of which are polyaniline salt form and poly indenofluorenone . 2000 Elsevier Science S.A. All rights reserved. Keywords: NLO; -Conjugated polymers; Absorption 1. Introduction 2. Third-order NLO properties in the range of two- photon absorption A high density of delocalized electrons present in - conjugated polymers leads to strong nonlinear optical A substantial part of the experimental effort in the field NLO properties of these materials. This par