窗口片（圆形&方形）
光学窗口片的规格说明：
*材料: BK7 或者其他材料
*长度公差:+/-0.01
*宽度公差:+/-0.01
*中心厚度公差:0.005mm
*光洁度:80-50 to 10-5 Scratch/Dig
*面型: *平行度<=1min -- 2sec
*通光孔径:80% -- 100%
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