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physics.optics2014
Femtosecond filamentation by intensity clamping at a Freeman resonance
Michael Hofmann, Carsten Brée
We demonstrate that Freeman resonances have a strong impact on the nonlinear optical response in femtosecond filaments. These resonances decrease the transient refractive index wit…
physics.optics2011
Comment on arXiv:1105.6334 "Optical nonlinearity in Ar and N near the ionization threshold"
Günter Steinmeyer, Ayhan Demircan, Carsten Brée
In a recent publication [Phys. Rev. Lett. 107, 103901 (2011)], Wahlstrand et al. reported to observe no indications for the appearance of the higher-order Kerr effect in a paramete…