Abstract The word'attosecond'(1 as= 10− 18 s) officially entered the vocabulary of physics
when sub-femtosecond pulses of UV/XUV light produced either by nonlinear frequency …

In principle, the temporal beating of superposed high harmonics obtained by focusing a
femtosecond laser pulse in a gas jet can produce a train of very short intensity spikes …

Subfemtosecond light pulses can be obtained by superposing several high harmonics of an
intense laser pulse. Provided that the harmonics are emitted simultaneously, increasing their …

BACKGROUND: Thoracic surgery may cause reduced respiratory function and pulmonary
complications, with associated increased risk of mortality. Postoperative physiotherapy aims …

We study high-order harmonic generation in the general case of absorbing and dispersive
atomic gas media. For ultrashort laser pulses, the harmonic conversion efficiency tends to a …

The energy spectrum of electrons produced by multiphoton ionization of xenon atoms has
been analyzed with a retarding potential technique. We have shown that the discrete …

Harmonic generation is a general feature of driven nonlinear systems. In particular high-
order harmonic generation (HHG) in atomic gases is the basis for producing attosecond …

A theoretical investigation is presented that examines the wavelength scaling from near-
visible (0.8 μ m) to midinfrared (2 μ m) of the photoelectron distribution and high harmonics …

The production of He+ and He 2+ by a 160 fs, 780 nm laser has been measured over an
unprecedented 12 orders of magnitude in counting range. Enhanced double electron …

A best evidence topic in thoracic surgery was written according to a structured protocol. The
question addressed was whether preoperative physiotherapy/pulmonary rehabilitation is …