Multiphoton absorption of solutions of polydiacetylene polyDCHD-HS measured using ps Z-scan at 1064 and 1500 nm

Year: 2003

Authors: Giorgetti E., Toci G., Vannini M., Giammanco F.

Autors Affiliation: Ist. di Fis. Applicata Nello Carrara, CNR, Via Panciatichi 64, 50127 Firenze, Italy; Dipartimento di Fisica E. Fermi, INFM Unit, Università di Pisa, Via F. Buonarroti 2, 56127 Pisa, Italy

Abstract: The nonlinear absorption of benzene and toluene solutions of polydiacetylene polyDCHD-HS was measured at lambda = 1064 and 1500 nm by using Z-scan and picosecond pulses with a trimmed Airy beam configuration. In the data analysis, we took into account both the saturation of the open aperture Z-scan traces occurring for high values of nonlinear absorption and the possible occurrence of cross-talk effects between nonlinear refraction and multiphoton absorption. The polymer exhibits three-photon absorption at both 1064 and 1500 mn. The molecular three-photon absorption coefficient at 1064 nm was sigma(3) = 1.8 x 10(-38) cm(6)/W-2 and sigma(3) = 2.3 x 10(-38) cm(6)/W-2 in toluene and benzene, respectively, while at 1500 nm it was sigma(3) = 1.5 x 10(-39) cm(6)/W-2 in toluene. On this basis, the optical limiting behavior of polyDCHD-HS in the near infrared range is also shown.

Journal/Review: OPTICS COMMUNICATIONS

Volume: 217 (1-6)      Pages from: 431  to: 439

More Information: National Research Council Sri Lanka, NRC. Università degli Studi di Genova. – This research was partially supported by the Italian “Progetto Finalizzato MSTAII” of the National Research Council and the Joint Project CNR/CONACYT of Scientific Collaboration between Italy and Mexico. The authors are indebted to Dina Cavallo and Professor Carlo Dell’ Erba (University of Genoa, Italy) for the preparation of polyDCHD-HS and to Dr. Ivana Moggio (CIQA, Saltillo, Mexico) and Professor Giovanna Dellepiane (University of Genoa, Italy) for stimulating discussions.
KeyWords: Benzene; Data reduction; Multiphoton processes; Photons; Signal processing; Toluene, Nonlinear refraction, Nonlinear systems
DOI: 10.1016/S0030-4018(03)01176-3

Citations: 17
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