Marieke F. Jager

TL;DR: A record speed is measured for the phase transition of 26 fs into a long-lived excited state of the metal that persists out to >60 ps and the measured femtosecond timescale provides fundamental insight into the electronic speed limits of these complex phenomena.

TL;DR: In this paper, the authors derived the transient dielectric function of crystalline germanium on femtosecond to picosecond time scales following photoexcitation by broadband visible-to-infrared (VIS/NIR) pulses.

TL;DR: The findings indicate the stringent conditions required to perform rigorous broadband XUV time-resolved absorption measurements on bulk solid-state samples, particularly those with temperature sensitivity, and elucidate a clear methodology to perform them.

TL;DR: In this article, high-order harmonics were generated by loosely focusing a high-energy laser pulse centered around 800 nm into a gas cell filled with argon in a phase-matching condition.

TL;DR: In this article, the authors proposed a method to optimize the spatial profile at off-focus locations of the high energy driving laser to avoid fully ionizing the target atoms, where the beam profile before or after the focal point depends on the wavefront quality of the laser beam and the near field intensity distribution.