Bena Optics' ultra-large high-precision windows are primarily processed using large ring polishing machines. Bena Optics currently has the largest ring polishing machine with a diameter of 2 meters, capable of processing large windows with a diameter of around 1 meter while ensuring high surface accuracy. Additionally, various materials can be processed, including fused silica, SiC, and Zerodur.
Processing Characteristics and Challenges of Ultra-Large High-Precision Windows
The super-size high precision windows supplied by Bena Optics not only possess all the features of commercial windows but also meet high precision requirements on an ultra-large scale, which is the main challenge in processing.
Bena Optics focuses on the ring polishing method. The ultra-large ring polishing machines are sufficient to meet the size requirements of customers. Ring polishing is a relatively gentle and lengthy process.
Material | Fused silica, SiC, Zerodur |
Diameter | Ø350mm~Ø950mm |
Diameter tolerance | ±0.1mm |
Surface quality | 40/20 |
Surface flatness | RMS≤λ/80 @1064nm |
Clear aperture | >90% of dia |
Bevel | <0.2mm x 45deg |
Coating | Up on clients’ request |
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