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直径:20mm; 厚度:2mm
材料：精退火K9光学玻璃
表面面型：波长/4 @ 633nm
平行差：小于30秒
表面光洁度：3~4级
直径误差：+0.0/-0.1mm
厚度公差：±0.2mm
倒边：保护性倒边0.2~0.5mmX45°
镀膜：见镀膜列表
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