Home / Custom / Optical Components / Optical Filter / Cut-off Linear Variable Filter 
The spectral transmittance curve at each position of the cutoff linear variable filter is consistent with that of the conventional cutoff filter, and the switching wavelength of the cutoff gradually changes with the change of the spatial position on the filter. Filter variable rate is available in 22.3nm/mm and 7nm/mm. Customers can choose variable rate and spectrum fan according to their own requirements.
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.
Ecoptik China's cut-off linear variable filters mainly covers short - wave and long - wave pass different band variable filters and can be customized.
Wavelength (nm) | Peak transmittance (%) | Depth of cut-off | Pass band | Linear rate of variable (nm/mm) | NOTE |
|---|---|---|---|---|---|
400-800 | ≥85 | ≥OD3 | Short pass | 7 | Customized be met |
400-800 | ≥85 | ≥OD3 | Long pass | 7 | |
380-850 | ≥85 | ≥OD3 | Long pass | 22.3 |
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