15 May 1994 Role of two-photon states in nonlinear optical dye chromophores
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The critical role of two-photon (pi) -electron excited states in third order optical processes in squaraine dyes is described. The discussion is based on recently completed femtosecond measurements of the excited state absorption spectrum of a typical centrosymmetric squaraine. The new experimental data agree well with the earlier theoretical description and quantum many-electron calculations reported for the dye chromophores.
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Yizhong Yu, Yizhong Yu, Rui-Fang Shi, Rui-Fang Shi, M. H. Wu, M. H. Wu, C. H. Grossman, C. H. Grossman, Anthony F. Garito, Anthony F. Garito, "Role of two-photon states in nonlinear optical dye chromophores", Proc. SPIE 2143, Organic, Metallo-Organic, and Polymeric Materials for Nonlinear Optical Applications, (15 May 1994); doi: 10.1117/12.173813; https://doi.org/10.1117/12.173813


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