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采用动态蒸馏提纯技术,配合优化的均化熔融和低温焠冷法技术,制备了高纯度的As40S60和As38S62硫系玻璃;通过高效挤压法制备出芯包结构的硫系光纤预制棒;在聚合物——聚醚砜树脂(PES)的保护下拉制出比例精确、离心率接近于0且损耗低的As40S60/As38S62芯包结构的硫系玻璃光纤。挤压过程可基本消除芯包界面的缺陷,从根本上降低了光纤的制备损耗。测试数据表明:经过有效提纯后,As40S60玻璃的红外透射率明显提高,绝大多数杂质吸收峰被消除。对芯包结构光纤输入端涂覆Ga层后,通过截断法进行了损耗测试,该光纤的传输背景损耗维持在0.2dB/m,在4.8μm处获得约为0.13dB/m的最低损耗。
High-purity As40S60 and As38S62 chalcogenide glasses were prepared by dynamic distillation purification technology combined with optimized homogenization and cryogenic quenching methods. Core-structured sulfur optical fiber preforms were prepared by high-pressure extrusion. Material-polyethersulfone resin (PES) protection down to produce the proportion of accurate, eccentricity close to 0 and low loss As40S60 / As38S62 core structure of the sulfur-based glass fiber. The extrusion process can basically eliminate the defects of the wick interface and fundamentally reduce the preparation loss of the optical fiber. Test data show that: after effective purification, As40S60 glass infrared transmittance increased significantly, most of the impurity absorption peak is eliminated. After the Ga layer was coated on the input end of the core structure, the loss was measured by the truncation method. The transmission loss of the optical fiber was maintained at 0.2 dB / m and the minimum loss of about 0.13 dB / m was obtained at 4.8 μm.