25 Mar 2011 The specification of Optical Windows as follow:
> Diameter(mm): +0/-0.05
> Center Thickness(mm): ± 0.02
> Scratch-Dig: 40-20
> Power (fringe): 1
> Irregularity (fringe): 0.5
> Parallelism (arc min): 1 arc minute
> Coatings: Upon requirement
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