Quantum model for Impulsive Stimulated Raman Scattering

TL;DR

This paper presents a fully quantum mechanical model of Impulsive Stimulated Raman Scattering (ISRS), moving beyond classical approximations, and validates it through comparison with experiments on quartz.

Contribution

It introduces a quantum-level description of ISRS that treats photonic and phononic modes without semi-classical assumptions, advancing theoretical understanding.

Findings

Quantum model aligns with semiclassical results

Model accurately predicts spectrally resolved pump extbackslash&probe measurements

Validates quantum approach for non-absorbing materials

Abstract

The interaction between ultrashort light pulses and non-absorbing materials is dominated by Impulsive Stimulated Raman Scattering (ISRS). The description of ISRS in the context of pump\&probe experiments is based on effective classical models describing the interaction between the phonon and pulsed electromagnetic fields. Here we report a theoretical description of ISRS where we do not make any semi-classical approximation and we treat both photonic and phononic degrees of freedom at the quantum level. The results of the quantum model are compared with semiclassical results and validated by means of spectrally resolved pump\&probe measurements on $\alpha$-quartz.