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Multiphoton Absorption of Solutions of Polydiacetylene polyDCHD-HS Measured using ps Z-scan at 1064 and 1500nm (Articolo in rivista)

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Multiphoton Absorption of Solutions of Polydiacetylene polyDCHD-HS Measured using ps Z-scan at 1064 and 1500nm (Articolo in rivista) (literal)

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Giorgetti E. 1, Toci G. 1, Vannini M. 1, Giammanco F. 2 (2003)
Multiphoton Absorption of Solutions of Polydiacetylene polyDCHD-HS Measured using ps Z-scan at 1064 and 1500nm
in Optics communications (Print)
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The molecular three-photon absorption cross section of polyDCHD-HS was measured for the first time in solutions of different solvents (toluene and benzene) and concentrations. We performed the measurements by Z-scan and using ps pulses at 1064 and 1500 nm. PolyDCHD-HS is a soluble and well processable polydiacetylene, which is promising for applications to all-optical switching devices in the telecommunications windows. For these reason, it is important to study its nonlinear behaviour in the NIR and at high pump levels, and particularly, to determine, if any, its properties as a multiphoton absorber. The paper also addresses the limits of a well-known technique as Z-scan, when applied to samples where multiphoton absorption properties coexist with a strong nonlinear refraction. In these cases, the interpretation of Z-scan data can be misleading if the experimental geometry and the incident intensity levels are not carefully tailored in advance. (literal)

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Multiphoton Absorption of Solutions of Polydiacetylene polyDCHD-HS Measured using ps Z-scan at 1064 and 1500nm (literal)

Abstract

The nonlinear absorption of benzene and toluene solutions of polydiacetylene polyDCHD-HS was measured at 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 nm. The molecular three-photon absorption coefficient at 1064 nm was and in toluene and benzene, respectively, while at 1500 nm it was in toluene. On this basis, the optical limiting behavior of polyDCHD-HS in the near infrared range is also shown. (literal)

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