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- W2000168354 abstract "We investigate the contribution of two-photon states to the third-order optical nonlinearity in four squaraine compounds. Our experimental results using third-harmonic spectral dispersion are compared to experimental results obtained by other researchers using quadratic electro-optic spectral dispersion and femtosecond excited state absorption measurements. Different relative contributions from high lying two-photon states are seen using different experimental techniques. We also relate these results to finite-field and sum-over states quantum chemical methods which indicate that there are multiple high-lying states that contribute to the third-order nonlinearity. For one of these dyes, we find that contributions from a mixture of isomers needs to be considered. For this latter dye, we compare our calculated transition moments and third harmonic dispersion curve using quantum mechanical methods with our results from third harmonic spectral dispersion and find substantial agreement between the experimental and theoretical results." @default.
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- W2000168354 date "1998-10-16" @default.
- W2000168354 modified "2023-09-23" @default.
- W2000168354 title "<title>Contribution of two-photon states to the third-order optical nonlinearity in squaraine compounds</title>" @default.
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- W2000168354 doi "https://doi.org/10.1117/12.328177" @default.
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