Title

Observation of three-photon enhanced four-photon absorption

Authors

Authors

F. Yoshino; S. Polyakov; M. G. Liu;G. Stegeman

Comments

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Abbreviated Journal Title

Phys. Rev. Lett.

Keywords

OPTICAL NONLINEARITIES; CONJUGATED POLYMER; POLYDIACETYLENE; SULFONATE; CRYSTALS; Physics, Multidisciplinary

Abstract

We report the measurement of instantaneous resonant four-photon absorption in the polydiacetylene-PTS [polymer poly(bis para-toluene sulfonate) of 2,4-hexadyine-1,6 diol]. Although normally too weak to be observable, an exact degeneracy between three- and four-photon absorption into the dominant exciton and two-photon states, respectively, resonantly enhances this effect so that it can be measured (four-photon coefficient alpha(4)=0.01 cm(5)/GW(3)) at its peak wavelength of 1900 nm. Femtosecond measurements from 1200 to 2200 nm of two- and three-photon absorption, and the nonlinear refractive index coefficient are also reported.

Journal Title

Physical Review Letters

Volume

91

Issue/Number

6

Publication Date

1-1-2003

Document Type

Article

Language

English

First Page

4

WOS Identifier

WOS:000184678200017

ISSN

0031-9007

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