Ordering Information – Reference Flats & Mirrors
Here is information required to order reference flats and mirrors complete with sample.
| Abbreviation | Selection | |
|---|---|---|
| F | Flat | F |
| D | Diameter (mm) | Numerical value |
| CA | Clear Aperture (mm) | Numerical value |
| t | Thickness (mm) | Numerical value |
| λ | Surface accuracy (P-V at 633nm) |
4 for λ/4 |
| 8 for λ/8 | ||
| 10 for λ/10 | ||
| 20 for λ/20 | ||
| SQ | Surface quality (Scratch / Dig) |
60 – 40 for 60/40 |
| 40 – 20 for 40/20 | ||
| 20 – 10 for 20/10 | ||
| 10 – 5 for 10/5 | ||
| Mtl | Material | P for Pyrex or equivalent |
| Q for Fused Quartz or equivalent | ||
| Z for Zerodur or equivalent | ||
| Ct | Coating | Al for Protected Aluminium |
| Ag for Protected Silver | ||
| Au for Protected Gold | ||
| UC for Unocated | ||
| Mnt | Mount and Mounting | M for Mounted on OS mount |
| UM for Un-Mounted | ||
Example:
A flat mirror with the following specifications would read as the Sample Ordering Code below.
| Type: | Flat |
|---|---|
| Diameter: | 305 mm |
| Clear Aperture: | 290 mm |
| Thickness: | 50 mm |
| Surface accuracy: | λ/10 P-V at 633nm |
| Surface quality: | 60/40 |
| Material: | Zerodur or equivalent |
| Coating: | Protected Aluminium |
| Mounting: | Mounted on OS Mount |
Sample Ordering Code
| F | D | CA | t | λ | SQ | Mtl | Ct | Mnt |
|---|---|---|---|---|---|---|---|---|
| F | / 305 | / 290 | / 50 | / 10 | / 60-40 | / Z | / Al | / M |