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Flat substrates

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Optical Flats are used as a reference (test plate) against which the flatness of an unknown surface may be compared. Each piece is precision polished by our master opticians and tested on a Zygo interferometer to insure the surface flatness. The secondary surfaces of our single surface flats are pitch polished to window quality for viewing the interference pattern. Each flat ships in a durable storage case for permanent protection. λ/20 flats also include a certificate of calibration.

Products specifications
Diameter (mm) 6.0
Effective Focal Length EFL (mm) 20 - 29.99
Coating MgF2
Focal Length FL(mm) 8.0 - 15.9
Primary Magnification PMAG Objective Required