Three- and four-photon absorption of a multiphoton absorbing fluorescent probe |
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Authors: | Hernández Florencio E Belfield Kevin D Cohanoschi Ion Balu Mihaela Schafer Katherine J |
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Affiliation: | Department of Chemistry and School of Optics/Center for Research and Education in Optics and Lasers/Florida Photonics Center of Excellence, University of Central Florida, Orlando, Florida 32816-2366, USA. florenzi@mail.ucf.edu |
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Abstract: | High-order multiphoton excitation processes are becoming a reality for fluorescence imaging and phototherapy treatment because they afford minimization of scattered light losses and a reduction of unwanted linear absorption in the living organism transparency window, making them less susceptible to photodamage, while improving the irradiation penetration depth and spatial resolution. We report the four-photon-excited fluorescence emission of (7-benzothiazol-2-yl-9,-didecylfluoren-2-yl)diphenylamine in hexane and its four-photon absorption cross section sigma4' = 8.1 x 10(-109) cm8 s3 photon(-3) for the transition S0 --> S1 when excited at 1600 nm with a tunable optical parametric generator (OPG) pumped by picosecond laser pulses. When pumped at 1200 nm, three-photon absorption was observed, corresponding to the same transition. |
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