Nonlinear focusing of supercontinuum driven by intense mid-infrared pulses in gas-filled capillaries

TL;DR

This paper demonstrates through simulations that mid-infrared pulses in gas-filled capillaries can undergo nonlinear focusing, significantly increasing peak intensity due to Kerr-induced supercontinuum focusing, with potential applications in nonlinear light conversion.

Contribution

It reveals a novel nonlinear focusing mechanism of supercontinuum driven by mid-infrared pulses in gas-filled capillaries, expanding understanding of pulse dynamics in nonlinear optics.

Findings

Peak intensity increases significantly due to Kerr-induced focusing.

Spectral broadening is highly efficient even below critical power.

Potential for controlling laser intensity in nonlinear applications.

Abstract

Strong mid-infrared light-matter interaction has attracted extensive attention as it opens up new frontiers in nonlinear optics. Here we observe through simulations a novel aspect of mid-infrared pulse dynamics in a high-pressure gas-filled capillary, where a pulse with a power well below the critical power for Kerr self-focusing undergoes an astonishing rise of the peak intensity following an extremely efficient spectral broadening. This intensity enhancement is attributed to the Kerr-induced focusing of the supercontinuum. Our study provides an interesting perspective for controlling the laser intensity with possible applications in nonlinear light conversion driven by mid-infrared pulses.