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Dual Surface Optical Flats
| Type | Dual Surface |
| Diameter (inches) | 1.00 |
| Diameter Tolerance (inches) | ±0.04 |
| Thickness (inches) | 0.50 |
| Thickness Tolerance (inches) | ±0.06 |
| Substrate | Fused Silica |
| Surface Accuracy (λ) | 1/10 |
| Coating | Uncoated |
| Index of Refraction nd | 1.458 |
| Abbe Number (vd) | 67.7 |
| Density (g/cm3) | 2.2 |
| Coefficient of Thermal Expansion CTE (10-6/°C) | 0.55 |
| Surface Quality | 60-40 |
| Parallelism (arcseconds) | 30 |
| RoHS | Compliant |