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Window is a piece of glass with plane parallel surfaces used to admit light into an optical system and to exclude dirt and moisture.

There can be extreme differences of temperature, pressure, humidity and other parameters on either side of the window.

When selecting windows the optical, mechanical and thermal properties must be considered according to the intended use: It should be of high purity and polish in order not to affect the optical system.

When large pressure differences are anticipated across the window extra thickness will be required to hold the flatness and parallelism specifications. Windows may also be used as coating substrates for use in a wide range of applications.

We provides varieties of single layer or multiplayer anti-reflecting coating on optical windows.

Please refer to Coatings chapter for more information.

The common materials we are manufacturing are: BK7, UV Fused Silica, Crystal Quartz, Sapphire, MgF2, CaF2, Silicon, Germanium and other crystal.

Please contact us with details of your requirement.

Manufacturing Tolerances:
Tolerances Commercial quality Precision quality Manufacturing limits
Glass Quality nd ±0.001 ±0.0005 Melt controlled
vd ±0.8% ±0.3% Melt controlled
Diameter(mm) +0.00/-0.10 +0.00/-0.05 +0.00/-0.01
Thickness(mm) ±0.10 ±0.02 ±0.005
Scratch-Dig 80-50 40-20 10-5
Power (fringe) 5 1 0.1
Irregularity (fringe) 2 0.5 0.05
Parallelism (arc min) 3-5 arc minutes 1 arc minutes Facility controlled
Bevel <0.25mm x 45°or upon requirement Facility controlled
Coating Upon requirement


The general tolerance specifications above provide a guideline regarding manufacturing capabilities for optics ranging in size from 1-600mm.

The manufacturing limits are not absolute; tighter tolerances may be possible.

Part specific tolerances may vary depending on component size, shape, and/or material.

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