A cut-off filter is an optical component capable of sharply or gradually separating the optical spectrum. It allows high transmission of light within a specific wavelength range while strongly suppressing (blocking) light in another range. Based on its cut-off characteristics, it is primarily categorized into two types: longpass filters and shortpass filters.
Excellent spectral control capability, allowing for customization of steep cut-off edges.
High transmission in the passband region.
Extremely high optical density (OD) achievable in the blocking zone.
| Material | Optical glass, Fused Silica |
| Diameter Tolerance | +0.0,-0.2 mm |
| Thickness Tolerance | +0.0,-0.1 mm |
| Parallelism | ＜30" |
| Transmitted Wavefront Error | λ/4@633nm |
| Blocking | OD≥2 |
| Clear Aperture | >90% CA |
| Surface Quality | 40/20-60/40 S/D |
