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空心布拉格光纤是具有一维光子晶体(1DPC)包层和空心芯区的新型光子带隙光纤。针对它在CO2激光传输中的应用,设计和制备了传输波段中心波长在10.6μm的空心布拉格光纤样品。利用傅里叶变换红外光谱仪(FTIR)可以观察到光纤样品在10.6μm具有明显的透射峰。使用CO2激光,通过截断法测量得到光纤样品在10.6μm的传输损耗为2.35dB/m。测量了不同弯曲曲率下光纤样品的弯曲损耗,结果表明弯曲损耗系数随曲率的增大而线性增长。在接近光纤输出端处,弯曲半径为10cm的光纤90°弯曲引入的附加损耗约为2dB。实验结果论证了光纤样品的CO2激光低损耗传输特性,展现了空心布拉格光纤在提升CO2激光操作灵活性上的应用潜力。
Hollow fiber Bragg fiber is a new type of photonic bandgap fiber with a one-dimensional photonic crystal (1DPC) cladding and a hollow core region. Aiming at its application in CO2 laser transmission, a hollow Bragg fiber sample with transmission wavelength of 10.6μm was designed and fabricated. Fiber samples were observed to have significant transmission peaks at 10.6 μm using Fourier Transform Infrared Spectroscopy (FTIR). Using CO2 laser, the transmission loss of the optical fiber sample at 10.6 μm was measured by the truncation method to be 2.35 dB / m. The bending loss of the fiber samples with different bending curvatures was measured. The results show that the bending loss coefficient increases linearly with the curvature increasing. Near the fiber output, an additional loss of about 2 dB is introduced by 90 ° bending of a fiber with a bend radius of 10 cm. The experimental results demonstrate the low loss transmission characteristics of CO2 laser in fiber samples and demonstrate the potential of hollow fiber Bragg fiber to enhance the operational flexibility of CO2 laser.