General Comments on Tolerancing Limits
This represents a general list of soft limits and is intended for reference only.
Reducing tolerance range increases costs.
Robust sensitivity analyses will help yield the most cost-effective tolerancing.
Tolerancing Limits for Prism Surfaces
| wdt_ID | Attribute | Prism Tolerancing Limit |
|---|---|---|
| 1 | Glass Quality (nd, vd) | Melt Rebalanced and Controlled |
| 2 | Diameter (mm) | +0, -0.010 |
| 3 | Center Thickness (mm)³ | ± 0.010 |
| 4 | Sag – Concave (mm) | ± 0.010 |
| 5 | Clear Aperture | 100%⁴ |
| 6 | Power⁵ | 0.1 HeNe fringes⁶ |
| 7 | Irregularity – Interferometry (HeNe fringes)⁵ | 0.1⁸ |
| 8 | Wedge Prism (window) – ETD (mm)⁹ | 0.002¹⁰ |
| 9 | Bevels – Face Width @ 45° (mm)¹¹ | sharp |
| 10 | Scratch – Dig (MIL-PRF-13830B)¹² | 10 – 5 |
| 11 | Surface Roughness (Å RMS)¹³ | 4 |
- This is for the most well-behaved materials. More difficult materials (CaF2, Ohara S-FPL, etc.) will need larger tolerance ranges.
- Of full aperture (FA)
- In addition to irregularity
- This represents lowest values obtained. Will grow with diameter. Will be larger with less well-behaved materials.
- Typical metrology is Zygo MetroPro plot for interferometry.
- This represents lowest values obtained. Will grow with diameter. Will be larger with less well-behaved materials.
- Also known as parallelism or pyramidal error in prism manufacture.
- Tighter specification is possible but can be extremely expensive. For a more economical limit, please consider using 0.005mm.
- Subject to measurement uncertainty
- Crystals and reflective materials will receive 40W inspection
- This represents lowest values obtained. Actual values for crystalline materials, especially polycrystalline, will be higher.
For more detailed information on any attribute, please contact sales@optimaxsi.com.