Femtosecond time-resolved absorption processes in lithium niobate crystals
| Autor: | Oliver Beyer, B. Sturman, Hung-Te Hsieh, Karsten Buse, Dominik Maxein, Demetri Psaltis |
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| Jazyk: | angličtina |
| Rok vydání: | 2005 |
| Předmět: |
Materials science
business.industry Lithium niobate Nonlinear optics Two-photon absorption Atomic and Molecular Physics and Optics Optical pumping Wavelength chemistry.chemical_compound Optics 2-Photon Absorption chemistry Femtosecond Induced Charge-Transport Transmission coefficient Absorption (electromagnetic radiation) business Caltech Library Services |
| Popis: | Femtosecond pump pulses are strongly attenuated in lithium niobate owing to two-photon absorption; the relevant nonlinear coefficient beta(p) ranges from similar to 3.5 cm/GW for lambda(p) = 388 nm to similar to 0.1 cm/GW for 514 nm. In collinear pump-probe experiments the probe transmission at the double pump wavelength 2 lambda(p) = 776 nm is controlled by two different processes: A direct absorption process involving pump and probe photons (,8, similar or equal to 0.9 cm/GW) leads to a pronounced short-duration transmission dip, whereas the probe absorption by pump-excited charge carriers results in a long-duration plateau. Coherent pump-probe interactions are of no importance. Hot-carrier relaxation occurs on the time scale of less than or similar to 0.1 ps. (c) 2005 Optical Society of America. |
| Databáze: | OpenAIRE |
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