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Null-screen testing of fast convex aspheric surfaces.

R Díaz-Uribe1, M Campos-García

  • 1Laboratorio de Optica Applicada, Centro de Instrumentos, Universidad Nacional Autónoma de México, Apartado Postal 70-186, México 04510, Distrito Federal México. rufino@aleph.cinstrum.unam.mx

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A novel null-testing method uses a cylindrical screen to verify fast convex aspheric optical surfaces. This technique accurately detects surface imperfections, ensuring optical component quality.

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Area of Science:

  • Optics and Optical Engineering
  • Metrology
  • Surface Science

Background:

  • Accurate characterization of optical surfaces is crucial for high-performance optical systems.
  • Existing null-testing methods can be complex or limited in applicability for certain aspheric geometries.
  • Fast convex aspheric surfaces present unique metrology challenges.

Purpose of the Study:

  • To present a new, practical null-testing method for fast convex aspheric optical surfaces.
  • To demonstrate the method's ability to detect surface deviations from the ideal design.
  • To validate the method's feasibility through experimental testing and numerical simulation.

Main Methods:

  • A cylindrical screen with precisely drawn lines is employed as a target.
  • The method relies on the reflected image of the screen from the optical surface.
  • A perfect surface should produce a perfect square grid; deviations indicate surface imperfections.

Main Results:

  • Experimental tests on a full hemisphere and a parabolic lens surface confirmed the method's feasibility.
  • Numerical simulations indicated the capability to detect surface departures as small as 5 micrometers.
  • The method provides a clear visual indication of surface quality.

Conclusions:

  • The presented cylindrical screen method offers a viable approach for null-testing fast convex aspheric optical surfaces.
  • This technique can effectively identify deviations from the desired surface shape, aiding in quality control.
  • The method's sensitivity and practicality make it a valuable tool in optical manufacturing and testing.