Home / Custom / Optical Components / Optical Filter / Narrow Bandpass Filter 
Based on the technique of all-dielectric hard coating and the principle of dielectric interference, and based on the characteristics of narrow-band optical pass filters, the optical properties are independent of the substrate. The narrow-band filter produced by Ecoptik China is more convenient to be built into the instrument imaging system so that its optical performance can be improved and effectively applied.
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.
| Material | Optical glass BK7/ Fused silica |
|---|---|
| Surface quality | 40/20, 20/10 |
| Thickness range | 0.5mm-5.0mm or upon the customer’s request |
| FWHM | 20nm, 30nm,40nm,50nm,60nm or upon the customer’s request |
| Wavelength range | 340nm, 380nm, 405nm, 450nm, 492nm 510nm,546nm,578nm, 600nm,620nm,630nm,650nm,850nm,805nm, 940nm, 1064nm |
| OD | OD3, OD4, OD5 |
| Dimension | 3mm-200mm |
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