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Aspheres
Off-Axis parabolic mirror
The term asphere means "non-spherical". It is used for all rotationally symmetrical and non-rotationally symmetrical optics. Possibilities for specifying aspherical surfaces are described in DIN ISO 10110-12.
Using ultra precision CNC machinery, LAYERTEC manages to process surfaces zonally so that the tool works on one point at a time. The possible surface forms and tolerances are only limited by the precision of the machine and the measurement equipment.
LAYERTEC offers a variety of aspherical optics within the specification limits listed in the table below:
| Parameter | Dimension | Tolerances |
|---|---|---|
| Total Diameter | 25 – 560 mm | < 0.1 mm |
| Inspection Range | < 550 mm | |
| Total Thickness | < 100 mm | < 0.1 mm |
| Sagittal height | < 50 mm | |
| Centering Error | < 50 µm | |
| Tilting Error | < 30" | |
| Surface form tolerance (PV) | < λ/4 (< λ/10 on request) | |
| Roughness* | < 4 Å (< 2 Å on request) |
*valid for measurements with optical profilometer taking into account spatial structures in the 0.65 – 55 µm range.
Aspheric Surface