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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:
|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.