High Conversion Efficiency in Multi-mode Gas-filled Hollow-core Fiber

TL;DR

This paper demonstrates a numerically simulated method for achieving high conversion efficiency in dispersive wave generation at 200 nm using a multi-mode gas-filled hollow-core fiber, highlighting the advantages of exciting LP$_{02}$-like modes.

Contribution

It introduces a novel approach of selectively exciting LP$_{02}$-like modes in a gas-filled hollow-core fiber to significantly enhance dispersive wave conversion efficiency.

Findings

Achieved >35% conversion efficiency at 200 nm

LP$_{02}$-like mode outperforms fundamental LP$_{01}$-mode in efficiency

Efficient dispersive wave generation due to shock effects and plasma-induced blue-shift

Abstract

In this letter, an energetic and highly efficient dispersive wave (DW) generation at 200 nm has been numerically demonstrated by selectively exciting LP$_{02}$-like mode in a 10 bar Ar-filled hollow-core anti-resonant fiber pumping in the anomalous dispersion regime at 1030 nm with pulses of 30 fs duration and 7 $\mu$J energy. Our calculations indicate high conversion efficiency of $>$35\% (2.5 $\mu$J) after propagating 3.6 cm fiber length which is due to the strong shock effect and plasma induced blue-shifted soliton. It is observed that the efficiency of fundamental LP$_{01}$-mode is about 15\% which is much smaller than LP$_{02}$-like mode and also emitted at longer wavelength of 270 nm.