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Like ordinary optical window sheets, tiny window sheets have two parallel surfaces and are used in most cases to protect sensors and other electronic instruments within the system from environmental conditions, but they are absolutely indispensable and should be adapted to the needs of the overall system.
Optical glass such as K9, fused silica, sapphire, MgF2, silicon (Si), ZnSe, ZnS, etc. These materials possess high transmittance, low absorption, low scattering, uniform refractive index, and specific dispersion characteristics.
Precisely hemispherical. The machining precision of the center and radius of curvature of the sphere is extremely high.
The surface is precision polished to an optical grade of 10-5 to ensure image quality and reduce scattering and aberrations.
An AR coating is typically applied to the concave surface to maximize the transmittance of specific wavelengths of light (e.g. visible light) and reduce reflection loss.
Item | Commercial | High Precision |
|---|---|---|
Material: | Visible material: BK7 (H-K9L), Float glass, Color glass, etc. UV material: Fused silica, Borosilicate glass, etc. IR material: Sapphire, Ge, Si, CaF2, MgF2, BaF2, LiF, ZnSe, ZnS, etc. | |
Dimension: | 1mm~10mm | |
Diameter tolerance: | ±0.1mm | ±0.03mm |
Angle tolerance: | ＜3 arc min | ＜10 arc sec |
Clear Aperture: | >90% of diameter | |
Surface Quality: | MIL60-40 | MIL20-10, 10-5 |
Surface flatness: | λ/4@ 632.8nm | λ/10@ 632.8nm |
Chamfer: | 0.05~0.2mm x 45° | |
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