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

Florencio E. Hernández, Kevin D. Belfield, Ion Cohanoschi, Mihaela Balu, Katherine J. Schafer

Research output: Contribution to journalArticlepeer-review

52 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)5394-5398
Number of pages5
JournalApplied Optics
Issue number28
StatePublished - Oct 1 2004
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering


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