F. Augé

TL;DR: It is found that the harmonics are locked in phase and form a train of 250-attosecond pulses in the time domain, suggesting that Harmonic generation may be a promising source for attosecond time-resolved measurements.

TL;DR: It is shown that harmonic generation in guided or freely propagating geometries are equivalent in the loose focusing regime and generalized to other advanced phase-matching schemes, thereby predicting the possibility to boost the conversion efficiencies using light noble gases.

TL;DR: In this article, the authors report a systematic study of high order harmonic generation with an infrared laser apertured by an iris, as a function of the aperture size, and show that the aperture diameter which maximizes harmonic yield is the result of a compromise between considerations of focal geometry and ionization, which favour small apertures; and harmonic dipole amplitude and phase (which favour large aperture).

TL;DR: The absolute timing of the high-harmonic attosecond pulse train with respect to the generating IR pump cycle has been measured for the first time.

TL;DR: In this paper, the authors optimized the high harmonic conversion efficiency in argon by studying the best experimental conditions for phase-matching, concentrating on focus geometry related to laser energy, cell length and position relative to the focus.