A novel dynamic scheme to reconstruct sub-50 atto-second pulses

TL;DR

This paper introduces a new dynamic streaking model and numerical scheme for accurately reconstructing sub-50 attosecond pulses, overcoming limitations of traditional methods for ultrashort pulse characterization.

Contribution

The paper presents a novel dynamic streaking model and a numerical reconstruction scheme that improves accuracy for sub-50 attosecond pulse characterization over existing methods.

Findings

Successfully reconstructs sub-50 attosecond pulses with high accuracy.

Demonstrates superiority over traditional FROG-CRAB algorithm in ultrashort pulse retrieval.

Provides detailed analysis of the influence of temporal phase on streaked spectrograms.

Abstract

The attosecond streaking technique is normally utilized to characterize the attosecond pulses in extreme ultraviolet spectrum, while the pulse simulation and reconstruction schemes turn out to be unreliable for extremely short sub-100as pulses. Based on systematical analysis and subtle investigation, we developed a dynamic streaking model for ultrashort photoelectron pulses and demonstrated concretely how the temporal phase of attosecond pulses would influence the streaked spectrogram. Upon that, a novel numeric scheme is established to retrieve the pulse-lengths and chirps. Different with the traditional FROG-CRAB algorithm utilizing the central energy approximation, our approach concerns the actual time-energy distribution of an electron wave-packet within sub-100as time-scale, capable for retrieving the temporal profiles of the ultrashort pulse more accurately.