单模As-Se红外玻璃光纤的制备及其性能研究

Fabrication of Single-Mode As-Se Infrared Glass Fiber and Its Performance

随着红外光纤制备技术的不断发展,低损耗、高非线性且结构完美的红外硫系光纤的研制迫在眉睫。采用了传统的熔融淬冷法和动态蒸馏纯化工艺制备了As40Se58Te2和As40Se60两种玻璃样品,基于两次多步挤压法制备了完美芯包阶跃结构的硫系光纤预制棒,在聚合物的保护下拉制出了损耗较低的阶跃型单模硫系玻璃光纤。结果表明:蒸馏纯化工艺可有效去除硫系玻璃中大部分杂质,2%摩尔百分比的Se被Te替换可有效实现小数值孔径并达到单模传输条件,采用截断法对单模硫系光纤进行了损耗测试,其最低损耗为1.66 d B/m(6.06μm),工作波段为2.5~12μm。以光参量放大器(OPA)为抽运源获得了覆盖1.5~13.2μm(40 d B带宽)的超连续谱输出,光纤有较好的中远红外传输性能和极高的光学非线性性能。

With the development of infrared optical fiber technology, it is urgent to develop an infrared low loss chalcogenide optical fibers with perfect-structure and high nonlinearity. In this paper,the two kinds of glass samples of As40 Se58 Te2 and As40 Se60 are prepared by the traditional vacuum melt-quenching method and dynamic distillation purification process. Then we obtain a fine-structured chalcogenide optical fiber prefabricated rod prepared by two multi-step extrusion method. After that,the preform is drawn into a low loss step type single-mode chalcogenides glasses fiber under the protection of polyether sulfone（ PES） polymer. The results show that the distillation process can effectively remove most of the impurities in the chalcogenide glasses. 2% mole percent of Se is replaced by Te,which can effectively achieve a small numerical aperture（ NA） and single-mode transmission characteristics. The single-mode chalcogenides fiber loss test is measured by the truncation method with a Fourier transform infrared spectroscopy spectrometer. The minimum loss of thisfiber can be reduced to 1. 66 dB/m at 6. 06 μm and these glasses working band is from 2. 5 to 12 μm. The output of a supercontinuum spectrum covering 1. 5-13. 2 μm（40 dB bandwidth） is obtained with an optical parametric amplifier（OPA） as the pump source. The fiber has good mid-far infrared transmission performance and extremely high optical nonlinearity.