Title

Direct Measurements Of Nonlinear Absorption And Refraction In Solutions Of Phthalocyanines

Keywords

Optical Nonlinearities; Single-Beam; Physics, Applied

Abstract

We report direct measurements of the excited singlet state absorption cross section and the associated nonlinear refractive cross section using picosecond pulses at 532 nm in solutions of phthalocyanine and naphthalocyanine dyes. By monitoring the transmittance and far field spatial beam distortion for different pulsewidths in the picosecond regime, we determine that both the nonlinear absorption and refraction are fluence (energy per unit area) rather than irradiance dependent. Thus, excited state absorption (ESA) is the dominant nonlinear absorption process, and the observed nonlinear refraction is also due to real population excitation.

Publication Title

Applied Physics B-Photophysics and Laser Chemistry

Volume

54

Issue/Number

1

Publication Date

1-1-1992

Document Type

Article

Language

English

First Page

46

Last Page

51

WOS Identifier

WOS:A1992HB49000006

ISSN

0721-7269

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