Two-Color Attosecond Chronoscope

TL;DR

This paper introduces a high-resolution two-color attosecond chronoscope that uses OTC laser fields to precisely measure electron emission timing by analyzing photoelectron momentum distributions.

Contribution

It presents a novel method combining numerical and analytical models to map photoelectron structures to attosecond response times in OTC laser fields.

Findings

Identified two characteristic structures in photoelectron distributions.

Established a quantitative link between structures and electron response time.

Demonstrated high-resolution timing of electron emission.

Abstract

We study ionization of atoms in strong orthogonal two-color ($\omega,2\omega$) (OTC) laser fields numerically and analytically. The calculated photoelectron momentum distribution shows two typical structures: a rectangular-like structure and a shoulder-like structure, the positions of which depend on the laser parameters. Using a strong-field model which allows us to quantitatively evaluate the Coulomb effect, we show that these two structures arise from attosecond response of electron inside an atom to light in OTC-induced photoemission. Some simple mappings between the locations of these structures and response time are derived, with which we are able to establish two-color attosecond chronoscope with high resolution for timing electron emission in OTC-based precise manipulation.