塑性弯曲蓝宝石单晶光纤的光学特性研究

为满足医用激光传能要求，使用CO2激光对直径分别为550um和750um的两组蓝宝石单晶光纤进行了塑性弯曲，平均弯曲半径为3.0mm，由单个弯曲引起的额外损耗在900nm处小于0.1dB,对脉冲Nd:YAG激光能量传输的损伤阈值高于30MW/cm^2。实验结果表明，塑性弯曲蓝宝石光纤完全可满足医用激光传能的要求，并可减小输出端弯曲光纤头的体积，增大光纤激光传输应用系统的灵活性。

Optical Properties of Plastic Bent Sapphire Fibers

In order to facilitate the medical laser transmission,in thispaper,weve plastically bent two groups of sapphire fibers with diameters of 550 μm and 750 μm by means of CO2 lasers,the average bending radius is 3.0 mm,the additional loss caused by a single bend is less than 0.1 dB at 900 nm,the damage threshold is higher than 30 MW/cm2 for Nd:YAG laser pulses.Experimental results show that plastically bent sapphire fibers can meet the demands of medical laser transmission with much smaller output fiber-tip sizes,and improve the flexibility of fiber-optic laser transmission systems.