Low-loss ultra-large mode area all-solid chalcogenide photonic crystal fiber for 20 W level mid-infrared laser delivery

To achieve mid-infrared high-power laser delivery, a single-mode large mode area (∼9900 µm 2 ) all-solid photonic crystal fiber (AS-PCF) based on As 2 Se 3 and As 2 S 3 chalcogenide glasses was designed. The finite element method was used to study the influence of structural parameters on the optical properties of the fiber. The AS-PCF was fabricated by the stacking-drawing method after material purification, and the optical loss, the near-field mode distributions, and the high-power laser transmission were measured. The fiber exhibits a minimum loss of 4.62 dB/m, which is the lowest loss among chalcogenide AS-PCF on record, and it can carry at least 20 W of high-power transmission, demonstrating strong potential for mid-infrared laser delivery applications.