Elsevier

Synthetic Metals

Volume 71, Issues 1–3, 1 April 1995, Pages 1649-1652
Synthetic Metals

Two-photon absorption and ultrafast optical computing

https://doi.org/10.1016/0379-6779(94)02992-8Get rights and content

Abstract

The two-photon absorption spectrum of oriented trans-polyacetylene was measured from 0.55 eV to 0.96 eV using photothermal deflection. The lowest lying Ag state is at 1.1 eV, below the 1.4 eV Bu state. The two-photon absorption susceptibility rules out waveguiding devices in trans-polyacetylene; by extension the two-photon absorption coefficient in other materials containing conjugated backbones should be measured before attempting fabrication of waveguide devices. An alternative approach to ultrafast optical computing is presented that uses spatially modulated four wave mixing to get around the problem of large two-photon absorption.

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