Two-Photon Excitation and Optical Spatial-Profile Reshaping via a Nonlinear Absorbing Medium
| Autor: | Loon-Seng Tan, Paras N. Prasad, Guang S. He, Yan Jiang, Jacek Swiatkiewicz, Bruce A. Reinhardt, Ramamurthi Kannan |
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| Rok vydání: | 2000 |
| Předmět: | |
| Zdroj: | The Journal of Physical Chemistry A. 104:4805-4810 |
| ISSN: | 1520-5215 1089-5639 |
| DOI: | 10.1021/jp000370+ |
| Popis: | Two-photon processes have recently received considerable attention, as they offer opportunities for both fundamental research and technological applications. In this paper, we illustrate both of these opportunities by reporting on a study of two-photon properties and discussing one specific application of a new chromophore, tris[4-(7-benzothiazol-2-yl-9,9-diethylfluoren-2-yl)phenyl]amine (AF-350). This new compound exhibits a large two-photon absorptive cross section and, more importantly from the application point of view, a high photochemical/photothermal stability. The nonlinear optical properties of an AF-350 solution were studied with ∼800-nm laser pulses in both nanosecond and femtosecond regimes. The two-photon excited fluorescence spectrum and temporal behavior were compared with the corresponding results obtained for one-photon excitation. There is an ∼11-ps delay between an ultrashort pump pulse and the first peak of the two-photon induced fluorescence signal, whereas no delay was measured betwe... |
| Databáze: | OpenAIRE |
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