Specifications:
| Surface Quality: | better than 40/20 scratch/dig |
| Parallelism: | < 10 arc sec |
| Optical Axis Orientation: | +/-0.2deg |
| Flatness: | < l/8 @632.8nm |
| Wavefront Distortion: | <l /4@632.8nm |
| Coating: | Coating upon Request |
Physical and Optical Properties
| Transparency Range : | 130-7000nm |
| Density : | 3.18 g /cm 3 |
| Melting point | 1255 °C |
| Mohs Hardness | 6 |
| Thermal Expansion Coefficients | parallel c-axis: 10.86 - 14.54 vertical c-axis: 6.23 - 9.25 |
| Specific heat capacity | 920 J kg -1 K -1 |
| Absorption coefficient (cm -1 ) | 0.07 at 0.2 µm; 0.02 at 5.0 µm |