为实现紫外波段激光的柔性传输,拉制了一款包层有7 根毛细玻璃管的空芯反谐振光纤。光纤的外径为95 μm,纤芯直径为11 μm;包层孔的直径平均为5 μm,壁厚平均为319 nm。经测试发现,该光纤可同时实现266 nm、355 nm两个重要的紫外激光波段的导光,传输损耗分别为0.25 dB/m@266 nm,0.8 dB/m@355 nm。测量光纤两个传输通带内的弯曲损耗,结果表明,当弯曲半径为5 cm时,弯曲损耗分别为0.05 dB/m@266 nm,0.023 dB/m@355 nm。该光纤纤芯直径小,对弯曲不敏感,使设备进一步小型化成为可能。拉制的这款无节点空芯反谐振光纤有望在激光传输和紫外激光光谱学中发挥重要作用。

To achieve the flexible transmission of an ultraviolet laser, a hollow antiresonant fiber with seven capillary tubes in the cladding was fabricated. The outer diameter of the fiber is 95 μm, and the core diameter is 11 μm. The average diameter of the cladding is 5 μm, and the average wall thickness is 319 nm. Two ultraviolet laser beams with wavelengths of 266 nm and 355 nm can be simultaneously guided by the fiber with transmission losses of 0.25 dB/m and 0.8 dB/m, respectively. The bending loss in the two transmission bands at a bending radius of 5 cm is 0.05 dB/m at 266 nm and 0.023 dB/m at 355 nm. The low bending sensitivity is due to the small core diameter of the fiber. This allows further miniaturization of the device. The antiresonant fiber is expected to play an important role in laser transmission and ultraviolet laser spectroscopy.