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Donatas Zigmantas. Portrait.

Donatas Zigmantas

Professor

Donatas Zigmantas. Portrait.

Picosecond z-scan measurements of the two-photon absorption in beta-carotene solution over the 590-790 nm wavelength range

Author

  • A. Major
  • F. Yoshino
  • J. S. Aitchison
  • P. W.E. Smith
  • D. Zigmantas
  • V. Barzda

Summary, in English

The two-photon absorption (TPA) properties of β-carotene (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 (∼4eV).

Publishing year

2005-07-21

Language

English

Pages

269-276

Publication/Series

Proceedings of SPIE - The International Society for Optical Engineering

Volume

5724

Document type

Conference paper

Keywords

  • Nonlinear spectroscopy
  • Optical nonlinearities in organic materials
  • Two-photon absorption

Conference name

Organic Photonic Materials and Devices VII

Conference date

2005-01-24 - 2005-01-26

Conference place

San Jose, CA, United States

Status

Published

ISBN/ISSN/Other

  • ISSN: 0277-786X