Home / Custom / Optical Components / Optical Filter / Band Pass Linear Variable Filter 
Linear variable filter adopts the continuous coating method and realizes the spatial continuous change of the filter characteristics based on the multi-layer wedge film structure. The target linear rate of change can be obtained by adjusting the slope of the film according to the dispersion requirement. Linear variable filter has high integrated spectral ability, which has irreplaceable advantages in the miniaturization and lightweight design of spectral instruments.
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.
Range of wavelength | 400-1000nm |
|---|---|
CWL | 1.5% |
Peak transmittance | ≥60% |
Depth of cut off | OD3 |
Wavelength of cut off | 300-1100nm |
Linear rate of variable | 50nm/mm |
Dimension | 32mm×13mm |
Effective size of variable area | 11.3mm×11.3mm |
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