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    Optics and sensor systems for civil and defense

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    Optics and sensors for police or military

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    We assist your engineering department with challenging projects

Silicon Window

Silicon Window (Si Window) widely used in IR sensors, thermal image, medical and optical measurement systems. ATE-DENMARK can supply high precision dimension control Silicon window with minimal transmitted beam geviation.

Material Silicon
Diameter Tolerance +0.0/-0.1mm
Thickness Tolerance ±0.2mm
Clear Aperture >Central 85% of diameter
Surface Quality 60-40 S/D
Parallelism < 1 arc minute
Wavefront Distortion λ/4 per 25mm @632.8nm
Protective Bevel <0.25mm x 45°
Coating Uncoated
Silicon Window Standard Products:
Part No. φ(mm) T(mm)
10.0 1.0
12.jul 2.0
25.apr 2.0


Other sizes and coatings are available upon request.

The general tolerance specifications above provide a guideline regarding manufacturing capabilities for optics.

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

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