产品指标如下:
Material Pyrex glass or substitute
Dia tolerance (inch) +0, -0.005
Dia tolerance (mm) +0, -0.13
Center Thickness tolerance ±0.010” (±0.25 mm)
Clear Aperture 85% Central Diameter
Parallelism 3 arc min
Surface Accuracy 1/4 wave at 633 nm
Surface Quality 60/40
Coating Protected Gold-Chromium
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