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Combined computer-generated hologram for testing steep aspheric surfaces.

A G Poleshchuk1, R K Nasyrov, J-M Asfour

  • 1Institute of Automation and Electrometry, Russian Academy of Science, Russia.

Optics Express
|April 1, 2009
PubMed
Summary
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A new Diffractive Fizeau Null Lens (DFNL) method uses a hybrid computer-generated hologram (CGH) to accurately test steep aspheres. This novel approach eliminates wavefront distortion for improved surface testing precision.

Area of Science:

  • Optics and Photonics
  • Metrology
  • Diffractive Optics

Background:

  • Interferometric testing is crucial for characterizing optical surfaces.
  • Testing steep axially symmetric aspheres presents significant metrological challenges.
  • Existing methods may suffer from inaccuracies due to transmitted wavefront distortion (TWD).

Purpose of the Study:

  • To introduce a novel combined computer-generated hologram (CGH) and interferometric testing method.
  • To present a new Diffractive Fizeau Null Lens (DFNL) design for testing steep aspheres.
  • To eliminate TWD and enhance the accuracy of aspheric surface testing.

Main Methods:

  • Development of a hybrid CGH incorporating two distinct diffractive structures.
  • Implementation of a novel Diffractive Fizeau Null Lens (DFNL) design.

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  • Validation of the method through interferometric testing of a spherical reference mirror (f/0.65).

    • Main Results:

    • The DFNL design successfully eliminates transmitted wavefront distortion (TWD) from the CGH substrate.
    • The novel method demonstrates increased accuracy in surface testing.
    • Successful testing of a challenging f/0.65 spherical reference mirror validates the approach.

    Conclusions:

    • The presented hybrid CGH and DFNL method offers a significant advancement in testing steep aspheres.
    • Elimination of TWD leads to more precise and reliable metrology for optical components.
    • This technique is suitable for high-accuracy interferometric testing of challenging optical surfaces.