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

摘要

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