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We report a silica glass nested capillary anti-resonant nodeless fiber withtransmission and low bending sensitivity in the mid-infrared around 4000 nm.The fiber is characterized in terms of transmission over 1700-4200 nmwavelengths, revealing a mid-infrared 3500-4200 nm transmission window, clearlyobservable for a 12 m long fiber. Bending loss around 4000 nm is 0.5 dB/mmeasured over 3 full turns with 40 mm radius, going up to 5 dB/m for full turnswith 15 mm radius. Our results provide experimental evidence of hollow-coresilica fibers in which nested, anti-resonant capillaries provide high bendresistance in the mid-infrared. This is obtained for a fiber with large corediameter of over 60 um relative to around 30 um-capillaries in the cladding,which motivates its application in gas fiber lasers or fiber-based mid-infraredspectroscopy of COx or NxO analytes.

Nested-capillary anti-resonant silica fiber with mid-infrared transmission and low bending sensitivity at 4000 nm