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Lasing characteristics and two-photon absorption (TPA) of merocyanine dyes with solvatochromism of different types are first investigated. Efficient lasing is excited in solutions pumped by radiation of the 2nd harmonic of a Nd-YAG laser (532nm) with the lasing efficiency exceeding 40% and by XeCl laser radiation (308nm) with the lasing efficiency up to 19%. The TPA cross-section at a wavelength of...