The body of the mirror is made of glass-ceramic, the same material of the gyro block.The reflective stice is made of fused quartz, whose surface can be polished to higher quality.

• 其基体采用与陀螺腔体材料相同的底膨胀系数的微晶玻璃，反射片采用抛光表面特性很好的熔石英玻璃，通过光胶接合组成一个完整的新型槽片。