A dichroic filter, also referred to as a dichroic mirror, is a specialized optical filter based on precision thin-film interference coatings. Its core function is to spatially separate light based on wavelength — efficiently reflecting specific wavelengths while simultaneously transmitting others with high efficiency.
High efficiency with low thermal effects.
Long lifespan and stable performance.
Complex design and manufacturing process, relatively high cost.
| 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 |
| Clear Aperture | >90% CA |
| Surface Quality | 40/20-60/40 S/D |
