As2Se3硫系玻璃非球面镜片的精密模压成型

Precision molding of As2Se3 chalcogenide glass aspheric lens

硫系玻璃镜片是新型温度自适应红外光学系统的重要组件之一。随着红外热成像民用市场的日益成熟,对硫系玻璃镜片的产业化技术需求越来越迫切。文中进行了As2Se3硫系玻璃非球面镜片的精密模压实验,研究并优化出口径Φ21 mm硫系镜片的模压工艺参数。通过模具的补偿修正,获得了完全满足镜片设计要求(PV值小于0.7μm)的模压镜片。此外,研究了模压处理对As2Se3玻璃物理性质的影响,发现模压后As2Se3玻璃的密度、硬度和玻璃转变温度Tg降低,最大透过率提高。通过拉曼光谱测试,分析并讨论了造成这种反常现象的微观结构原因。为今后较大口径非球面硫系镜片的批量制造提供了科学数据和参考。

Chalcogenide glass lens is one of the important components for novel temperature-adaptation IR optical systems. With the development of thermal imaging civil market, the demand for industrialization technology of chalcogenide glass lens is increasing rapidly. Precision molding of As2Se3 chalcogenide glass aspheric lens were studied systematically. A series of molding process parameters were investigated and optimized for As2Se3 chalcogenide lens with a diameter of Φ21 mm. Through the compensation correction of the mould, chalcogenide lens that met the design precision of PV <0.7 μm were fabricated successfully. Effect of molding on the physical properties of As2Se3 chalcogenide glass was also investigated. The results show that after molding, the density, hardness, and glass transition temperature of As2Se3 glass decrease, whereas its maximum transmittance increases. With the help of Raman spectra, the microstructural origin of these abnormal phenomena was analyzed and discussed. This work would provide data and reference for future fabrication of large-aperture aspheric chalcogenide lens.