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Proceedings Paper

Z-scan measurements of two-photon absorption for ultrashort laser radiation
Author(s): A. Ajami; M. S. Rafique; N. Pucher; S. Bashir; W. Husinsky; R. Liska; R. Inführ; H. Lichtenegger; J. Stampfl; St. Lüftenegger
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Paper 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.

Paper Details

Date Published: 19 December 2008
PDF: 8 pages
Proc. SPIE 7027, 15th International School on Quantum Electronics: Laser Physics and Applications, 70271H (19 December 2008); doi: 10.1117/12.822530
Show Author Affiliations
A. Ajami, Vienna Univ. of Technology (Austria)
M. S. Rafique, Vienna Univ. of Technology (Austria)
N. Pucher, Vienna Univ. of Technology (Austria)
S. Bashir, Vienna Univ. of Technology (Austria)
W. Husinsky, Vienna Univ. of Technology (Austria)
R. Liska, Vienna Univ. of Technology (Austria)
R. Inführ, Vienna Univ. of Technology (Austria)
H. Lichtenegger, Vienna Univ. of Technology (Austria)
J. Stampfl, Vienna Univ. of Technology (Austria)
St. Lüftenegger, Vienna Univ. of Technology (Austria)

Published in SPIE Proceedings Vol. 7027:
15th International School on Quantum Electronics: Laser Physics and Applications
Tanja Dreischuh; Elena Taskova; Ekaterina Borisova; Alexander Serafetinides, Editor(s)

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