General Comments on Manufacturing Limits
This represents a general list of soft limits and is intended for reference only.
Reducing tolerance range increases costs.
Optimax advises a close consideration of budget (tolerance, delivery, or dollar) versus need to be made prior to choosing any value below.
Robust sensitivity analyses will help yield the most cost-effective tolerancing.
Tolerancing Limits for Spherical Surfaces
| wdt_ID | Attribute | Sphere Tolerancing Limit |
|---|---|---|
| 1 | Glass Quality (nd, vd) | Melt Rebalanced and Controlled |
| 2 | Diameter (mm) | +0, -0.010 |
| 3 | Center Thickness (mm)⁴ | ± 0.020 |
| 4 | Sag – Concave (mm) | ± 0.010 |
| 5 | Clear Aperture | 100%⁵ |
| 6 | Radius (mm)⁶ | ± 0.0025 or 1 HeNe fringe⁷ |
| 7 | Irregularity (HeNe fringes)⁸ | 0.05⁹ |
| 8 | Wedge Lens – ETD (mm) | 0.002¹⁰ |
| 9 | Bevels – Face Width @ 45° (mm) | ± 0.05¹¹ |
| 10 | Scratch – Dig (MIL-PRF-13830B)¹² | <10 – 5 |
| 11 | Surface Roughness (Å RMS) | 3¹³˒¹⁴ |
- This is for the most well-behaved materials. More difficult materials (CaF2, Ohara S-FPL, etc.) will need larger tolerances ranges.
- Of full aperture (FA)
- In addition to irregularity
- Whichever is correspondingly larger over the clear aperture
- Coverage dependent, stitched or otherwise, and also subject to system error
- As geometry requirements move closer to a min or max shown the less likely this is possible
- This specification is extremely tight and 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, especially polycrystalline materials, will be higher.
- With scan length and filter appropriate for the selected spatial period.
For more detailed information on any attribute, please contact sales@optimaxsi.com.