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Two-photon fluorescence of Rhodamine B (RhB) measured relative to hyper-Rayleigh scattering of para-nitroaniline (pNA) gives the absolute two-photon absorption cross section of RhB at λ = 1064 nm, δ = 2.2 ± 0.2 × 10-50 cm4 s, and is 3-9 × smaller than previous results.
© 1997 Optical Society of America
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