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Fused Quartz Optical Flat Double Sided Lambda/20 51mmdia x 10mmthk

Ships within 1-2 weeks
SKU: TYQ5222
More Information
Diameter (mm) 51
Material Fused quartz
Thickness (mm) 10
Type Double sided
Flatness Lambda/20

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.

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 with tolerances of +/-0.25mm on dimensions.

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.

Surface finish:
Flatness face 1 & 2 on dual face polished flats:
Flatness face 1 on single sided polished flats:
Flatness face 2 on single sided polished flats:
<5 angstrom off pitch
As specified over 90% aperture
As specified over 90% aperture
Commercial polish
<5 arcmin (or better if required)

We can manufacture Quartz and Zerodur Optical Flats to any size at short notice. Simply use the Custom Optics button.
Optical flats can be coated with a range of standard or custom mirror coatings for high quality mirrors or beamsplitters.