This optical window is precision-engineered from FS Grade 0G fused silica, delivering excellent homogeneity and durability. The window has a diameter of 25.40 mm ± 0.10 mm and thickness of 1.0 mm ± 0.10 mm, making it ideal for applications requiring tight dimensional tolerances. The edges are fine-ground, while the main edges are laser cut. Cosmetic finish is held to a 40/20 scratch-dig standard—ensuring clean, clear transmission without distracting surface defects.