In situ accurate determination of the zero time delay between two independent ultrashort laser pulses by observing the oscillation of an atomic excited wave packet

TL;DR

This paper introduces a new in situ method using atomic wave packet oscillations to precisely measure the zero time delay between two ultrashort laser pulses, improving synchronization accuracy in experiments.

Contribution

The paper presents a physically-based technique that accurately determines the zero time delay between independent femtosecond pulses using atomic wave packet oscillations.

Findings

Achieved high-precision zero time delay measurement

Demonstrated method's effectiveness in practical experiments

Provided a solution for in situ laser pulse synchronization

Abstract

We propose a novel method that uses the oscillation of an atomic excited wave packet observed through a pump-probe technique to accurately determine the zero time delay between a pair of ultrashort laser pulses. This physically-based approach provides an easy fix for the intractable problem of synchronizing two different femtosecond laser pulses in a practical experimental environment, especially where an in situ time zero measurement with high accuracy is required.