Home Aspheres & Cylinders DIOPTIC DFNL Asphere Metrology using Diffractive Fizeau Null Lenses

DIOPTIC DFNL Asphere Metrology using Diffractive Fizeau Null Lenses

Product Code:
DFNL
Manufacturer: DIOPTIC

Interferometric precision testing: Take advantage of DIOPTIC's know-how to increase your efficiency and save valuable time by using their diffractive Fizeau null lenses.

  • Easy handling: measuring aspheres as easy as measuring spheres
  • Compatible with standard interferometer bayonet mount
  • With integrated Fizeau reference plane
  • Measurement of the vertex radius of curvature with integrated cat-eye beam
  • Plane surface for recalibration of the Fizeau plane

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With patented DFNL measuring lenses (Diffractive Fizeau Null Lenses), DIOPTIC offer a consistently highly precise and user-friendly solution. In order to mount DIOPTIC DFNLs on an interferometer, they offer a bayonet mount for sizes 4 to 12 inches for all commonly used interferometers. There is therefore no need for a complex adjustment of a standard CGH relative to the interferometer. Application areas include the testing of precision optics in photography, video lenses, projection, as well as the testing of large optics in astronomy and of satellite optics.

Advantages of using DIOPTIC DFNLs:

  • A DFNL replaces the normal combination of transmission sphere and CGH
  • DFNLs are compatible with all Fizeau interferometers
  • Simple handling thanks to integrated adjustment holograms
  • High measurement precision and intrinsic error correction (Fizeau principle)
  • Typical accuracy: lambda/10
  • Short delivery times with the possibility for express service
  • Testing of free-form surfaces is possible
  • Testing of aspheric diffractive optics possible

Do you have special requirements? CGHs can be adjusted to your specific needs.

Size of bayonet mount 2" to 12"
Maximum active area diameter <200mm
Integrated alignment features Optional: cat-eye beams
Lowest f-number f/0.9
Measuring accuracy <PV lambda/20 (lambda/40 with calibration
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