# Transient-absorption phases with strong probe and pump pulses

## TL;DR

This paper investigates the quantum dynamics of Rb atoms under intense pump and probe pulses, predicting transient-absorption spectra and analyzing the effects of strong-field-induced phases on spectral features.

## Contribution

It introduces an analytical model to interpret transient-absorption spectra in a three-level atomic system under strong-field conditions, linking spectral features to atomic populations and phases.

## Key findings

- Transient-absorption spectra depend on pump-probe delay and pulse intensities.
- Strong-field-induced phases significantly influence absorption line shapes.
- Analytical model effectively describes oscillating spectral features.

## Abstract

The quantum dynamics of a system of Rb atoms, modeled by a V-type three-level system interacting with intense probe and pump pulses, are studied. The time-delay-dependent transient-absorption spectrum of an intense probe pulse is thus predicted, when this is preceded or followed by a strong pump pulse. Numerical results are interpreted in terms of an analytical model, which allows us to quantify the oscillating features of the resulting transient-absorption spectra in terms of the atomic populations and phases generated by the intense pulses. Strong-field-induced phases and their influence on the resulting transient-absorption spectra are thereby investigated for different values of pump and probe intensities and frequencies, focusing on the atomic properties which are encoded in the absorption line shapes for positive and negative time delays.