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Broadband Excited State Dynamics of Common Reverse Saturable Absorbing Dye Media.

Published online by Cambridge University Press:  15 February 2011

Kenneth J. McEwan  and
Richard C. Hollins
Kenneth J. McEwan
Affiliation:
Defence Research Agency, Malvern, United Kingdom.
Richard C. Hollins
Affiliation:
Defence Research Agency, Malvern, United Kingdom.
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Abstract

In this paper we describe a technique by which the broadband excited state absorption/emission and dynamics can be measured for materials with either linear or two photon absorption. The technique is applied to two different dyes in solution and to a cyano-biphenyl organic liquid. The ratio of σex/σgr for HITCI in methanol is greater than 1 from 400 to 570nm and at 532nn is determined to be 25; the excited state lifetime is 800ps. For CAP in methanol σex/σgr is greater than 1 from 400–650nm and is 14 at 532nm. Dimer absorption and emission are found to contribute to the excited state response in this material. In the organic liquid broadband (400–570nm) excited state absorption is measured following two photon excitation at 588nm.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 374: Symposia ZB – Materials for Optical Limiting , 1994 , 375
Copyright
Copyright © Materials Research Society 1995

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