19 December 2008 Z-scan measurements of two-photon absorption for ultrashort laser radiation
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Proceedings Volume 7027, 15th International School on Quantum Electronics: Laser Physics and Applications; 70271H (2008) https://doi.org/10.1117/12.822530
Event: 15th International School on Quantum Electronics: Laser Physics and Applications, 2008, Bourgas, Bulgaria
Abstract
We have developed a low cost apparatus for open- and closed-aperture Z-scan measurements of multi-photon absorption (MPA) cross-sections of solid and liquid samples. The experimental setup uses simple diodes for light detection. The signals are recorded with a low-cost two-channel PC-scope. We have developed a LabView based software, which analyzes single laser pulses and allows averaging over several shots. First measurements on a CR-39 polymer demonstrated the functioning of the method. Furthermore, we have shown that for 25fsec ultra short pulses three-photon absorption (ThPa) must be considered in addition to two-photon absorption (TPA). The appropriate nonlinear absorption (TPA-, ThPA-) coefficients and the nonlinear refractive index can be obtained via a best fit of the data to theoretical curves, which have been derived and adapted for ThPA from formulas for TPA accessible in the literature.
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A. Ajami, M. S. Rafique, N. Pucher, S. Bashir, W. Husinsky, R. Liska, R. Inführ, H. Lichtenegger, J. Stampfl, St. Lüftenegger, "Z-scan measurements of two-photon absorption for ultrashort laser radiation", Proc. SPIE 7027, 15th International School on Quantum Electronics: Laser Physics and Applications, 70271H (19 December 2008); doi: 10.1117/12.822530; https://doi.org/10.1117/12.822530
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