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Proceedings Paper

Optical limiting based on multiphoton processes in carbon nanostructures and heterocyclic quadrupolar molecules
Author(s): Raffaella Signorini; D. Pedron; C. Ferrante; Renato Bozio; Giovanna Brusatin; Plinio Innocenzi; F. Della Negra; Michele Maggini; Alessandro Abbotto; L. Beverina; Giorgio A. Pagani
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Paper Abstract

A novel scheme for implementing the joint exploitation of different, somehow complementary mechanisms of nonlinear transmission in an optical limiting device is proposed. As active materials we have chosen the fullerene derivative FULP, as a reverse saturable absorber, and a new heterocyclic quadrupolar dye, PEPEP, with highly efficient multiphoton absorption for nanosecond pulses. The nonlinear absorption properties of PEPEP in solution are extensively investigated for both femtosecond and nanosecond pulses. When Z-scan experiments are performed with nanosecond pulses, much larger effective cross sections are measured than with femtosecond pulses and with remarkably different wavelength dispersion. This is interpreted as due to two-photon absorption followed by one-photon absorption from the excited state. Chemically modified nonlinear molecules are incorporated in a hybrid organic-inorganic sol-gel matrix. Sufficiently high concentrations are achieved to allow the assembling of thin sol-gel disks into a "tandem" limiter with a total thickness smaller than the Rayleigh range of the focused laser beam. Preliminary testing of our limiter is reported and shows encouraging results. The resistance of the FULP-doped sol-gel glass to laser damage is substantially improved and the nonlinear attenuation at high pulse energies is enhanced.

Paper Details

Date Published: 14 February 2003
PDF: 14 pages
Proc. SPIE 4797, Multiphoton Absorption and Nonlinear Transmission Processes: Materials, Theory, and Applications, (14 February 2003); doi: 10.1117/12.454849
Show Author Affiliations
Raffaella Signorini, Univ. degli Studi di Padova (Italy)
D. Pedron, Univ. degli Studi di Padova (Italy)
C. Ferrante, Univ. degli Studi di Padova (Italy)
Renato Bozio, Univ. degli Studi di Padova (Italy)
Giovanna Brusatin, Univ. degli Studi di Padova (Italy)
Plinio Innocenzi, Univ. degli Studi di Padova (Italy)
F. Della Negra, Univ. degli Studi di Padova (Italy)
Michele Maggini, Univ. degli Studi di Padova (Italy)
Alessandro Abbotto, Univ. degli Studi di Milano-Bicocca (Italy)
L. Beverina, Univ. degli Studi di Milano-Bicocca (Italy)
Giorgio A. Pagani, Univ. degli Studi di Milano-Bicocca (Italy)


Published in SPIE Proceedings Vol. 4797:
Multiphoton Absorption and Nonlinear Transmission Processes: Materials, Theory, and Applications
A. Todd Yeates; Kevin D. Belfield; Stephen J. Caracci; Christopher M. Lawson; Francois Kajzar; A. Todd Yeates; Kevin D. Belfield; Stephen J. Caracci, Editor(s)

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