新型挤压法制备硫系玻璃光纤及其性能研究

Fabrication and properties of chalcogenide optical fiber based on a novel extrusion method

选用组分为Ge15Sb20S65和Ge25Sb5Se70的两组硫系玻璃,制备了多种尺寸的高质量硫系玻璃,分析了两组玻璃的物理、热学和光学性能;利用复合层叠挤压法制备了硫系玻璃光纤预制棒,避免了钻孔法或其他机械加工引起的预制棒界面缺陷,且光纤端面结构可随模具尺寸自由设计,挤压后光纤预制棒结构整齐,内外界面整洁光滑;利用高温聚合物保护的预制棒具有良好的机械性能,用光纤拉丝机将具有保护层的预制棒拉制成光纤;利用普通光纤抛光机进行端面抛光,光纤端面结构均匀,界面无明显缺陷。傅里叶红外光纤光谱仪(FTIR)测试光纤损耗谱表明,在波长4.8μm处光纤的最低损耗为2.63dB/m。

First of all,Ge15Sb20S65and Ge25Sb5Se70bulk chalcogenide glasses with different sizes were prepared and their physical,thermal and optical properties are discussed in detail.A novel coextrusion method is adopted to fabricate the fiber perform based on the stacked billet of multi-material.Then,the preform is jacked with a high strength and high temperature polymer.After that,the preform is drawn into fiber with a specialized fiber drawing tower.The well-controlled cross-section of the fiber with uniform and clear structure is verified by an optical microscope after a well polishing process.Fourier transform infrared spectrometer is performed to determine the optical loss.The lowest optical loss of the fiber is 2.63dB/m at wavelength of 4.8μm.The infrared fiber field will be benefited very much by this novel fabrication approach.