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(a) Absorption spectra. (b) Linear refractive indices. Full dots . Open dots .
Schematic of the experimental setup. The sample is located in the focal region. The labels refer to: lenses ; mirrors ; beam splitters ; neutral filters .
Experimental -scan transmittances (points) for sample A ( thick) and sample ( thick) for at .
Linear refractive index at , NL refractive index , two-photon absorption coefficient , figure-of-merit , and predictions of the BGO model .
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