Substratum，hemi-spherical }zHG]k,j  
Flatness L/2 @633 nm on flat surface or better(specify). @86I|cY  
Figure irregularity L/10@633nm. B%KfB VC  
no chips exceeding ~ 6Hi"
w  
Thickness specified at the edge, all types. DgC;1U'  
Substratum BK7 D20×5 PCX f+ 300 mm i8`0-  
有哪位哥哥姐姐懂的，幫忙翻譯一下，誠謝��！

質(zhì)地，半球 -{S:sK.o  
平整度：L/2@633nm(特殊要求可更高) 7cZ(g