Enhancement of filamentation postcompression by astigmatic focusing

Enhancement of filamentation postcompression by astigmatic focusing.

The energy scaling up of pulse postcompression is still an open issue. In this work we analyze the use of astigmatic focusing to improve the output pulses in a filamentation based postcompression setup. Unlike spherical conditions, astigmatic focusing enhances the output energy and the spectral broadening of the filament. This is due to the increase of critical power, allowing a considerable im...

Transition from linear- to nonlinear-focusing regime in filamentation

Laser filamentation in gases is often carried out in the laboratory with focusing optics to better stabilize the filament, whereas real-world applications of filaments frequently involve collimated or near-collimated beams. It is well documented that geometrical focusing can alter the properties of laser filaments and, consequently, a transition between a collimated and a strongly focused filam...

Luminosity enhancement by focusing and colliding beams in a plasma.

The potential gain of luminosity by both focusing and colliding e+ebeams in an underdense plasma is investigated. We first suggest the possibility of creating the plasma by the beam self-induced “tunneling ionization” of a gas. We then study the beam optics in the continuous focusing environment provided by the plasma, and the subsequent e + e beam-beam interaction in the same plasma. When appl...

Filamentation and linewidth enhancement factor in InGaAs quantum dot lasers

Variants of the focusing NLS equation. Derivation, justification and open problems related to filamentation

The focusing cubic NLS is a canonical model for the propagation of laser beams. In dimensions 2 and 3, it is known that a large class of initial data leads to finite time blow-up. Now, physical experiments suggest that this blow-up does not always occur. This might be explained by the fact that some physical phenomena neglected by the standard NLS model become relevant at large intensities of t...