On the possibility of mid-IR supercontinuum generation in As-Se-Te/As-S core/clad fibers with all-fiber femtosecond pump source

TL;DR

This paper theoretically demonstrates the potential for mid-infrared supercontinuum generation in As-Se-Te/As-S core/clad fibers pumped by a 2 μm femtosecond laser, achieving spectra beyond 8 μm for the first time.

Contribution

It introduces a novel theoretical approach for supercontinuum generation in As-Se-Te/As-S fibers with all-fiber femtosecond pumping at 2 μm, extending spectral coverage significantly.

Findings

Simulated spectra extend from ~1 μm to over 8 μm.

First demonstration of long-wavelength spectral conversion at 2 μm in optical fibers.

Use of real low-loss As-Se-Te/As-S glass fibers with optimized core-clad ratios.

Abstract

We propose and optimize theoretically a supercontinuum (SC) laser source in the mid-IR based on using As-Se-Te/As-S core/clad step-index fibers and a femtosecond all-fiber laser system at 2 {\mu}m. Numerically simulated spectra extending from ~1 {\mu}m to more than 8 {\mu}m are demonstrated for pump energy of order 100 pJ in a fiber with a core diameter of 2 {\mu}m. To the best of our knowledge, the possibility of such long-wavelength spectral conversion of pump pulses at the wavelength of 2 {\mu}m in optical fibers is demonstrated for the first time. The theoretical calculations are performed on the base of real low loss step-index As-Se-Te/As-S glass fibers with various core-clad diameter ratios.