High-Order Harmonic Generation and Quasi-Phase-Matching With Self-Guided Femtosecond Laser Pulses

Femtosecond filamentation in transparent media

“…However, the estimated intensity is based on the assumption that the pulse duration has not been changed during filamentation. As can be seen in Section 4.1.5, pulse self-compression occurs during filamentation so that a correction by a factor 4-10 is required, yielding peak intensities in agreement with the results of Lange et al (1998a). Independently, Becker et al (2001a) found slightly higher values for the peak intensity in a gas of nitrogen molecules from an analysis of the fluorescence signals.…”

“…Estimates based on the measurements of the energy and the dimensions of the filament give a set of dispersed values ranging between 10 12 and 10 14 W/cm 2 . A more precise measurement was performed by Lange et al (1998a). It consists in introducing a filament, after its propagation over a distance of 50 cm in air, inside a cell containing a noble gas, like argon (see Fig.…”

“…(b) The figure shows the odd harmonics ranging between the 11th and 23rd orders. FromLange (1998);Lange et al (1998a).…”

Femtosecond Filamentation in Air

“…The energy of the free electrons in the xenon gas is measured by a detector of time of flight, which informs about the energy of VUV photons responsible for ionization. The figure on the right-hand side shows the odd harmonics ranging between the 11th and 23rd orders (according to Lange et al [46])…”

“…Estimates based on the measurements of the energy and the dimensions of the filament give a set of dispersed values ranging between 10 12 and 10 14 W/cm 2 . A more precise measurement was performed by Lange et al [45,46]. It consists in introducing a filament, after its propagation over a distance of 50 cm in air, inside a cell containing a noble gas, like argon (see 1.11).…”