Abstract
The range of organic compounds whose degenerate two-photon absorption (2PA) spectrum
has been reported has increased rapidly in recent years, in parallel with the growing
interest in applications based on the 2PA process. The comparison of results from
different techniques is not always straightforward, and experimental conditions
employed may vary significantly. We overview the concepts underlying 2PA measurements
and the common assumptions and approximations used in the data analysis for various
techniques. The importance of selecting appropriate excitation regimes under which
measurements should be performed and of avoiding contributions from absorption
mechanisms in addition to 2PA will be emphasized.
© 2010 Optical Society of America
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