Quartz Optical Flats

Knight Optical

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Optical flats are single precision flat surfaces. They are used as reference surfaces to compare flatness of a substrate where flatness is unknown. When a high quality optical flat is placed on top of a polished substrate and used in conjunction with a monochromatic light source light bands are formed. The light bands that are present are known as interference fringes and their shape represents how flat the part being tested measures. Dependent on how many rings are formed or how straight the presented lines are is an indication of how flat the tested part is. Optical flats are used for testing gauge blocks. Optical flats are also used in interferometers and high quality flat optical mirror and window sub-straights for laser applications.

• Material: Quartz • Surface quality: <60:40 scratch/ dig • Surface finish: <5 angstrom off pitch • Flatness face 1 & 2 on dual face polished flats: As specified over 90% aperture • Flatness face 1 on single sided polished flats: As specified over 90% aperture • Flatness face 2 on single sided polished flats: Commercial polish • Parallelism: <5 arcmin better if required

This range of quartz optical flats are single-sided. Quartz has low thermal expansion properties and is very durable and cost effective solution over UV grade fused silica. Quartz optical flats are also available in lambda/10 and lambda/20 types from stock.

We can also supply lambda/4, lambda/8 and lamda/16 optical flats on short lead times. Each quartz optical surfaces flat is tested on our Zygo Verifire XPZ interferometer system fitted with the latest Mx^®software and are supplied certified in a quality wooden box. Knight Optical also offer a rework and calibration service for optical flat, please enquire.

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Published: June 2017