Results of experimental investigations into the nonlinear absorption of the symmetric polymethine 1-butyl -3,3-dimethyl-2-[5-(1-butyl-3,3-dimethyl-3H-benz[e]indoline-2-uledene)-1,3-pentadienyl]-3H-benz[e]indolium perchlorate dye solution excited by radiation of a femtosecond titanium-sapphire laser (20 fs, 800 nm, 75 MHz, and 300 mW) by the open aperture z-scan method are presented. Record limitation of the femtosecond laser radiation intensity (by 300 times at a 93% linear transmission of the medium) was achieved. The nonlinear absorption mechanisms in organic dyes with anti-Stokes excitation by wideband high-power pulsed radiation to the absorption band edge and the prospects for organic dye application for limitation of the femtosecond laser radiation intensity are discussed.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 3, pp. 54‒58, March, 2010.
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Svetlichnyi, V.A., Meshalkin, Y.P., Kirpichnikov, A.V. et al. Limiting the intensity of femtosecond pulses with anti-stokes excitation of organic dye solutions. Russ Phys J 53, 270–275 (2010). https://doi.org/10.1007/s11182-010-9413-2
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DOI: https://doi.org/10.1007/s11182-010-9413-2