大口径激光玻璃环抛光学沥青抛光胶

Optical polishing pitch for continuous polishing of large-aperture laser glass

研制了四种不同沥青和松香含量的光学沥青抛光胶,对其形貌、针入度、玻璃化转变温度、软化点和粘度等参量进行了表征。从组成和结构分析了抛光胶三种物理状态变化原因,将玻璃化转变温度和软化点作为其临界转变温度。实验研究了四种抛光胶对大口径激光玻璃的抛光效果,发现抛光胶中沥青和松香的质量分数分别为30%和70%时,抛光效果比较理想,在像散和表面疵病控制方面能够满足要求,可作为大口径激光玻璃抛光专用胶。

Four types of optical polishing pitches with different contents of pitch and rosin were prepared, and the morphol ogy, penetration, glass transition temperature, softening point and viscosity of these polishing pitches were investigated. Three physical states of the polishing pitches were analyzed based on the composition and structure using glass transition temperature and softening point as the transition temperatures of physical states. It was experimentally found that the polishing pitch with the pitch and rosin mass rate of 30 % and 70 % could be well applied to large-aperture laser glass. It provides an advantage for control ling the astigmatism and surface defect efficiently. Quantitative studies on physical parameters of optical polishing pitch is benefi cial for the preparation, quality inspection and stable performance of optical polishing pitch, and could also improve the polishing efficiency of large-aperture laser glass.