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Generally, the window is parallel for both sides to protect the optical system and will be AR coating (AR: Anti Reflection) to prevent the loss of light beam. Depending on the application, the window material is used BK-7, Quartz, Sapphire, and so on.
|Super Precision||High Precision||Standard Precision|
|Material||BK7 grade A optical glass|
|Flatness(@633mm)||λ / 10||λ / 4||25mm per 1λ|
|Parallelism||10 arc seconds||30 arc seconds||1 arc minutes|
|Bevel||0.25mm × 45|
|Coating||Available upon request|