| Autor: |
Cassano, Tiziana, Tommasi, Raffaele, Meacham, Andrew P., Ward, Michael D. |
| Předmět: |
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| Zdroj: |
Journal of Chemical Physics; 4/15/2005, Vol. 122 Issue 15, p154507, 6p, 1 Diagram, 1 Chart, 6 Graphs |
| Abstrakt: |
We investigated nonlinear absorption of picosecond laser pulses in a Ru complex [{Ru(bipy)2}2L][PF6] using the open-aperture Z-scan technique. Experiments were performed in a spectral region of moderate linear absorption (λ=532 nm, σg=0.65×10-16 cm-2). We observed a transition from reverse saturable absorption to saturable absorption when the excitation intensity was higher than 50 GW/cm2. To determine the population level kinetics, a model based on three- and four-level systems was considered, and the rate equations solved taking into account the propagation equation of the laser pulse inside the sample. Fitting of the experimental data allows extraction of the excited-states absorption cross sections and lifetimes. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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