High-energy, shock-front assisted resonant radiation in the normal dispersion regime

TL;DR

This paper introduces a theory predicting resonant radiation in the deep normal dispersion regime driven by high-energy ultrashort pulses, supported by experiments in silica, expanding understanding of nonlinear pulse dynamics.

Contribution

The paper presents a new theory predicting resonant radiation bands without zero-dispersion points, validated by experimental results in silica.

Findings

Resonant radiation occurs in deep normal dispersion regime.

The theory accurately predicts phase-matching conditions.

Experimental data in silica confirms the theory.

Abstract

We present a simple yet effective theory that predicts the existence of resonant radiation bands in the deep normal group velocity dispersion region of a medium, even in absence of a zero-group velocity dispersion point. This radiation is evident when the medium is pumped with high-energy ultrashort pulses, and it is driven by the interplay between the Kerr and the shock terms in the NLSE. Accurate experiments performed in bulk silica fully support the theoretical phase-matching condition found by our theory.