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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 43, Iss. 28 — Oct. 1, 2004
  • pp: 5394–5398

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

Florencio E. Hernández, Kevin D. Belfield, Ion Cohanoschi, Mihaela Balu, and Katherine J. Schafer  »View Author Affiliations


Applied Optics, Vol. 43, Issue 28, pp. 5394-5398 (2004)
http://dx.doi.org/10.1364/AO.43.005394


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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 σ4′ = 8.1 × 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.

© 2004 Optical Society of America

OCIS Codes
(160.2540) Materials : Fluorescent and luminescent materials
(190.4180) Nonlinear optics : Multiphoton processes
(300.2530) Spectroscopy : Fluorescence, laser-induced
(300.6410) Spectroscopy : Spectroscopy, multiphoton

History
Original Manuscript: September 15, 2003
Revised Manuscript: March 10, 2004
Published: October 1, 2004

Citation
Florencio E. Hernández, Kevin D. Belfield, Ion Cohanoschi, Mihaela Balu, and Katherine J. Schafer, "Three- and four-photon absorption of a multiphoton absorbing fluorescent probe," Appl. Opt. 43, 5394-5398 (2004)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-43-28-5394

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