尺寸公差：±0.05mm
                                      角度公差：±3″
                                      表面精度：λ/10 @ 632.8nm
                                      表面质量：20-10
                                      通光口径：> 90%
                                      倒    边：< 0.3×45°
                                      镀    膜：依客户要求定制