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Nonlinear Optical Properties of Modified Carbocyanines

Published online by Cambridge University Press:  03 September 2012

Nansheng Tang ,
Weijie Su ,
Thomas M. Cooper ,
Daniel G. McLean ,
Donna M. Brandelik  and
Richard L. Sutherland
Nansheng Tang
Affiliation:
Materials Directorate, Wright Laboratory, WL/MLPJ, Wright-Patterson AFB, OH 45433-7702
Weijie Su
Affiliation:
Materials Directorate, Wright Laboratory, WL/MLPJ, Wright-Patterson AFB, OH 45433-7702
Thomas M. Cooper
Affiliation:
Materials Directorate, Wright Laboratory, WL/MLPJ, Wright-Patterson AFB, OH 45433-7702
Daniel G. McLean
Affiliation:
Science Applications International Corporation, 101 Woodman Drive, Dayton, OH 45431
Donna M. Brandelik
Affiliation:
Science Applications International Corporation, 101 Woodman Drive, Dayton, OH 45431
Richard L. Sutherland
Affiliation:
Science Applications International Corporation, 101 Woodman Drive, Dayton, OH 45431
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Abstract

We studied the optical nonlinearities of modified 3,3′-diethylthiadicarbocyanine iodides (X-DTDCI) in dimethyl sulfoxide (DMSO) solutions (X = H, Cl, Br at meso position) by a pump-probe technique with crossed polarized chirped laser pulses at room temperature. Reverse-saturable-absorption (RSA) with monoexponential lifetimes is observed at 532 nm in all the samples studied. We determined the effective excited-state absorption cross-sections and their lifetimes for all the samples investigated and found that they clearly correlate to the substituent X at the meso position. Empowered by the chirped pulses, a much faster nonlinearity with a decay time of ˜3.1 ps that is much shorter than the laser pulses used, is unveiled in Cl-DTDCI. We expressed both the absorptive and the refractive part of this fast nonlinearity as the equivalent molecular hyperpolarizability γ1212 and found γ1212 = (8.1 + i9.8) × 10−32erg−1.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 479: Symposium S – Materials for Optical Limiting II , 1997 , 17
Copyright
Copyright © Materials Research Society 1997

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