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Proceedings Paper

Picosecond z-scan measurements of the two-photon absorption in beta-carotene solution over the 590-790 nm wavelength range
Author(s): Arkady Major; Fumiyo Yoshino; J. Stewart Aitchison; Peter W. E. Smith; Donatas Zigmantas; Virginijus Barzda
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Paper Abstract

The two-photon absorption (TPA) properties of beta-carotene in chloroform solution were investigated over the 590-790 nm wavelength range. The TPA was characterized using the open-aperture z-scan technique with picosecond pulses provided by a widely traveling-wave optical parametric amplifier (OPA) pumped with a Ti:sapphire laser amplifier. We found the 0.2-1 cm/GW values of two photon absorption coefficient in the 725-790 nm wavelength region. At shorter wavelengths, a dramatic increase in the two-photon absorption around 600 nm was observed. The observed two photon absorption dependence on the excitation wavelength can be explained by the onset of strong excitation from the ground state 1Ag to the higher lying two-photon allowed m2Ag band centered around 310 nm (~4 eV).

Paper Details

Date Published: 4 April 2005
PDF: 8 pages
Proc. SPIE 5724, Organic Photonic Materials and Devices VII, (4 April 2005); doi: 10.1117/12.590669
Show Author Affiliations
Arkady Major, Univ. of Toronto (Canada)
Fumiyo Yoshino, Univ. of Toronto (Canada)
J. Stewart Aitchison, Univ. of Toronto (Canada)
Peter W. E. Smith, Univ. of Toronto (Canada)
Donatas Zigmantas, Univ. of Toronto (Canada)
Virginijus Barzda, Univ. of Toronto (Canada)

Published in SPIE Proceedings Vol. 5724:
Organic Photonic Materials and Devices VII
James G. Grote; Toshikuni Kaino; Francois Kajzar, Editor(s)

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