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                        | Cut Filter |  
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    |      | Material | Fused Silica,  N-BK7, H-K9L, Corning HPFS |    | Size Range | Circular, Square or  prisms |    | Diameter  Tolerance | +0.1/-0.1 to +/-0.05 |    | Angle  Tolerance | +/-30sec |    | Polishing | Customerized  polishing surface |    | Flatness | 2L - L/4 |    | Surface  quality | 40-20 |    | Clear Aperture | 95% of the surface |    | Coating | Customized |  |  |  |  |  |