Einfluss dynamischer Resonanzen auf die Wechselwirkung optischer Femtosekunden-Pulse mit transparenten Dielektrika

It is expected that during the linear interaction of a medium with an optical pulse the induced dielectric polarization follows the electric field instantaneously, if the fundamental wavelength is far away from any resonance. However, with increasing intensity - in the regime of nonlinear optics - unexpected resonances may occur through the generation of higher harmonics or by the ac Stark shift of the energy levels in the laser field. For this work I perform quantum mechanical simulations of titanium dioxide and atomic hydrogen which confirm the existence of dynamic resonances by variation of the laser field's wavelength or intensity. My numerical results corroborate the measurement of one of the shortest polarization delays in dielectric solids that were reported at near-infrared wavelengths. Furthermore, by considering the detected resonance effects the established phenomenological model of femtosecond filamentation in atomic gases can be extended by a quantum mechanically computed ionization rate.

Author dc:creator

• Hofmann, Michael

Advisor dc:contributor.advisor

• Knorr, Andreas

Licence dc:rights.uri

• http://rightsstatements.org/vocab/InC/1.0/

Language dc:language.iso

de

Identifier URI

http://dx.doi.org/10.14279/depositonce-5613

OAI identifier oai:identifier

oai:depositonce.tu-berlin.de:11303/6029