Mid-infrared supercontinuum generation spanning from 1.9 to 5.7μm in a chalcogenide fiber taper with ultra-high NA

摘要

Highlights?We fabricated a ChG fiber with ultra-high NA (>1.35).?The fiber taper was prepared by using a homemade tapering setup.?A broadband SC generation spanning from 1.9 to 5.7μm was obtained.?The fiber taper was pumped at different pump wavelengths with same pump power.AbstractWe report a broadband supercontinuum generation in a chalcogenide fiber taper with an ultra-high numerical aperture. The chalcogenide step-index fiber consisting of As2Se3core and As2S3cladding was fabricated by using the isolated stacked extrusion method. The fiber taper with a core diameter of 1.75μm was prepared by employing a homemade tapering setup. By pumping the fiber taper with a femtosecond laser pulses at 3.3μm, a broadband supercontinuum generation spanning from 1.9 to 5.7μm was achieved.