Three- and four-photon absorption of a multiphoton absorbing fluorescent probe

    Authors

    F. E. Hernandez; K. D. Belfield; I. Cohanoschi; M. Balu;K. J. Schafer

    Comments

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    Abbreviated Journal Title

    Appl. Optics

    Keywords

    FLUORENE DERIVATIVES; EXCITATION; MICROSCOPY; TRANSITIONS; Optics

    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 sigma(4)' = 8.1 x 10(-109) cm(8) s(3) photon(-3) for the transition S-0 -- > S-1 when excited at 1600 nm with a tunable optical parametric generator (OPG) pumped by picosecond laser pulses. When pumped at 1200 run, three-photon absorption was observed, corresponding to the same transition. (C) 2004 Optical Society of America.

    Journal Title

    Applied Optics

    Volume

    43

    Issue/Number

    28

    Publication Date

    1-1-2004

    Document Type

    Article

    Language

    English

    First Page

    5394

    Last Page

    5398

    WOS Identifier

    WOS:000224355600015

    ISSN

    1559-128X

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