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Two-photon absorption (TPA) cross sections of an organic dye, trans-4-[p-(N-hydroxyethyl-N-methylamino)tyryl]-N-methylpyridinium iodide (abbreviated as ASPI), from 720 to 1100nm have been measured by using nonlinear transmittance method, which reflect the TPA degrees of the dye at different wavelengths. The maximum TPA wavelength is located at 930nm. The upconversion efficiencies of ASPI in dimethyl...
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