用于CO_2激光传输的10.6μm波段空心布拉格光纤  

Hollow-Core Bragg Fiber with a Transmission Band of 10.6 μm for Carbon Dioxide Laser

作　　者：金杰[1] 张巍[1] 石立超[1] 黄翊东[1] 彭江得[1] 

机构地区：[1]清华大学电子工程系,北京100084

出　　处：《中国激光》2012年第8期103-107,共5页Chinese Journal of Lasers

基　　金：国家973计划(2010CB327606);北京市自然科学基金(4102028)资助课题

摘　　要：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-core Bragg fiber is a kind of photonic bandgap fiber which has a cladding of one dimensional photonic crystal （1DPC） and an air core. Aiming at its application on C02 laser transmission, a hollow-core Bragg fiber sample with a transmission band of 10.6μm is designed and fabricated. Its transmission spectrum is measured by Fourier transform infrared spectrometer （FTIR）, showing an obvious low loss transmission peak at 10.6 μm. Measured by cutback method using a CO2 laser, the transmission loss at 10.6 μm of the fiber sample is 2.35 dB/m. The additional loss induced by fiber bending is also measured under different fiber curvatures, showing that it rises with increasing curvature. Experiments show that a fiber bending of 90° with a bending radius of 10 cm near the fiber output end leads to an additional loss about 2 dB. The experimental results demonstrate the low loss transmission of CO2 laser by the hollow-core Bragg fiber sample, showing its great potential on improving the flexibility of CO2 lasers.

关 键 词：光纤光学 空心布拉格光纤 CO2激光 一维光子晶体 

分 类 号：TN253[电子电信—物理电子学]