📏 Product Specifications
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Manufacturer / Model: CVI Melles Griot, part number 02 WBK 326
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Material: Optical-grade N‑BK7 borosilicate crown glass—highly uniform, excellent visible and near‑IR transmission, low inclusions, high durability
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Diameter: approximately 50 mm (4 cm)
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Thickness: 10 mm as standard for that size series
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Surface flatness: λ/10 transmitted wavefront error—that is, an optical flatness of tenth‑wave at 633 nm
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Surface parallelism: typically better than a few arcminutes (often ≤5 arc min)
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Surface quality (scratch‑dig): often in the range 20‑10 or 40‑20 depending on batch/grade—typical laser‑grade quality



