Natsume Optical Corporation (NOC) accomplishes nanometer (nm) precision of the surface accuracy by Ultra-precision grinding/cutting technology and surface correction technology such as Magnetorheological Finishing (MRF).
NOC has a production capability of Gull-wing Asphere or Pancake Asphere, which are generally considered difficult to manufacture and measure.
Measuring equipment such as interferometer (Zygo - VFA 6, Zygo - New View) and precise 3D profiler (Panasonic - UA3P, etc.) have been enhanced. These measurement technologies allow us to evaluate Form error, Waviness and Micro-roughness per spatial frequency, which may lead to various errors in the optical system.
Size: φ5 - 200mm
Standard specifications: Concave: 5mm - ∞, Convex: 5mm - ∞
(Aspheric departure)/Diameter: < 1/50
Achievable accuracy: PVr < λ/40
MRF (Magnetorheological Finishing)