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| Natura: | Artículo científico |
| Lingua: | en |
| Pubblicazione: |
Sociedade Brasileira de Física
2005
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| Accesso online: | https://www.redalyc.org/articulo.oa?id=46435408 |
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Sommario:
- Dependence of transition probabilities for non-linear photo-ionization of He atoms on the structure of the exciting radiation pulses A. Rubens B. de Castro Thomas Moeller H. Wabnitz T. Laarmann Física, Astronomía y Matemáticas We discuss the expected dependence of the probability transitions for 2-photon and 3-photon absorption inHelium gas on the spatial and temporal structure of the exciting radiation pulses. Regarding spatial structure, weassumed a Gaussian radial intensity distribution; we find, as expected, that the 2-photon and 3-photon processesbecome negligible at distances D away from the focus, where D is of the order of the beam waist FWHM.Regarding temporal structure, we compared transition probabilities for square, Gaussian and cosine squaredtemporal profiles; we find that for the same FWHM, Gaussian and cosine squared pulses give essentially thesame transition probabilities, but the square pulses are about twice as efficient. We finally studied the effect ofsharp versus smooth rise and fall edges in the light pulse; we find negligible correlation with the shape of thepulse edges, and strong correlation with the pulse FWHM, i.e., with pulse total energy, as might be expected. 2005 artículo científico 0103-9733 https://www.redalyc.org/articulo.oa?id=46435408 en http://www.redalyc.org/revista.oa?id=464 Brazilian Journal of Physics application/pdf Sociedade Brasileira de Física Brazilian Journal of Physics (Brasil) Num.3A Vol.35