Kyung Taec Kim

TL;DR: In this article, it was shown that orbital angular momentum is conserved during high-harmonic generation of a beam with an angular-dependant phase Φ = lϕ about the beam axis.

TL;DR: In this article, the instantaneous field of an unknown pulse is imprinted onto the deflection of the attosecond extreme ultraviolet pulse using an all-optical set-up with a bandwidth up to 1 PHz.

TL;DR: In this paper, an all-optical photonic streaking measurement is demonstrated that provides direct experimental access to individual attosecond pulses, and the effects of non-adiabatic electron dynamics and plasma formation on the generated attoscond pulse train are directly observed when the pulse train is applied to harmonic generation in gases.

TL;DR: In this paper, a method for obtaining a single sub-50-attosecond pulse using harmonic radiation is proposed, where the chirped structure of the harmonic radiation imposes a limit on the minimum achievable pulse duration, but its positive chirp can be compensated by the negative group delay dispersion of an appropriately selected x-ray filter material, used also for the spectral selection.

TL;DR: In this paper, an all-optical method to measure the space-time characteristics of an isolated attosecond pulse, without temporal and spatial averaging, is demonstrated, which may possibly be used to finely control the pulse characteristics.