Excited-state characterization and effective three-photon absorption model of two-photon-induced excited-state absorption in organic push-pull charge-transfer chromophores

Journal Article · Thu Sep 01 04:00:00 EDT 2005 · Journal of the Optical Society of America. Part B, Optical Physics

DOI:https://doi.org/10.1364/JOSAB.22.001939· OSTI ID:20696491

Sutherland, Richard L; Brant, Mark C; Heinrichs, Jim; Rogers, Joy E; Slagle, Jonathan E; McLean, Daniel G; Fleitz, Paul A ^[1]

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1. Science Applications International Corporation, Dayton, Ohio 45431 (United States)

We report experimental investigations of two-photon and excited-state absorption in D-{pi}-A chromophores and propose a model to explain nonlinear absorption in the nanosecond regime. The key parameter is an effective three-photon absorption coefficient that depends on the two-photon absorption cross section and excited-state photophysical properties. We obtain all these parameters from independent measurements and then compare the model with nanosecond nonlinear transmission measurements. We find good agreement with the data, using no free parameters, for specific values of some published two-photon absorption cross sections. We conclude that excited singlet-singlet and triplet-triplet absorption are the dominant sources of nonlinear transmittance loss and that the chief role of two-photon absorption is to populate these states.

• OSTI ID: 20696491
• Journal Information: Journal of the Optical Society of America. Part B, Optical Physics, Journal Name: Journal of the Optical Society of America. Part B, Optical Physics Journal Issue: 9 Vol. 22; ISSN JOBPDE; ISSN 0740-3224
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABSORPTION
CHARGE EXCHANGE
COMPARATIVE EVALUATIONS
CROSS SECTIONS
EXCITED STATES
LINEAR ABSORPTION MODELS
MULTI-PHOTON PROCESSES
NONLINEAR OPTICS
NONLINEAR PROBLEMS
ORGANIC COMPOUNDS
PHOTONS
TRIPLETS