Can a reflectivity of less than 0.5% really be achieved?

A: Yes, but vacuum magnetron sputtering multi-layer precision coating is required. The reflectivity of ordinary screen glass is approximately 4%, while single-layer AR coating can reduce it to 1-2%, and multi-layer precision magnetron sputtering coating can lower it to below 0.5%. The principle is to use multiple layers of optical films with different refractive indices and thicknesses to make the reflected light from all interfaces cancel each other out (destructive interference). The process requirements are extremely high: ① Vacuum environment (dust-free, avoiding particle defects); ② Precisely control the thickness of each layer (at the nanometer level); ③ Multi-layer film system design (usually 5 to 9 layers); ④ The purity of the target material is high. Woowhead Guanfudun adopts vacuum magnetron sputtering AR· anti-glare coating, with a reflectivity of ≤0.5% (self-test data under the standard test environment of the brand laboratory), which is approximately one-eighth of that of ordinary glass. Note: 0.5% is the self-test data from the brand laboratory, not an SGS test item (SGS tested light transmittance of 96.5%, haze of 0.4%, and impact resistance). Users can compare and observe under the light. If the reflection is significantly reduced, it is considered effective.