An absolute test for axicon surfaces
Jun Ma1, Christof Pruss, Rihong Zhu
1Institut für Technische Optik, Universität Stuttgart, Pfaffenwaldring 9, Stuttgart, 70569, Germany. optmj@yahoo.cn
Optics Letters
|June 3, 2011
Summary
This study introduces an absolute testing method for axicon surfaces using symmetry. The technique removes errors from the testing setup, enabling precise measurement of surface deviations.
Area of Science:
- Optical metrology
- Surface testing
- Axicon optics
Background:
- Accurate characterization of optical surfaces is crucial for high-performance optical systems.
- Existing methods for axicon testing often struggle with absolute accuracy and error removal.
Purpose of the Study:
- To develop and validate a novel method for the absolute testing of axicon surfaces.
- To eliminate systematic errors originating from the interferometer and null optics.
- To enable precise determination of local surface deviations on axicons.
Main Methods:
- Exploiting axicon symmetry to perform shifted measurements within a null test setup.
- Acquiring four measurements with two distinct shifts of the axicon surface.
- Employing a double-side spiral-path direct integration for wavefront reconstruction.
- Simulating error propagation including systematic and statistical errors.
Main Results:
- Demonstrated removal of interferometer and null optics errors through the proposed method.
- Achieved absolute surface local deviation measurement via wavefront reconstruction.
- Validated the method through simulations and experimental testing of a 90° axicon.
Conclusions:
- The presented method provides a robust approach for the absolute testing of axicon surfaces.
- This technique enhances the accuracy of optical surface metrology.
- The findings are critical for the fabrication and quality control of axicon-based optical systems.
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