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The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

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Testing of rod objects by grazing-incidence interferometry: experiment.

S Brinkmann¹, T Dresel, R Schreiner

¹Lehrstuhl für Optik, UniversitätErlangen-Nürnberg, Staudtst 7, D-91058 Erlangen, Germany. sven@pi5wsc.physik.unierlangen.de

|February 29, 2008

Summary

This summary is machine-generated.

This study introduces a novel grazing-incidence interferometer using computer-generated holograms for precise surface testing. The innovative method achieves submicrometer precision in measuring macroscopic surface deviations on technical components.

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Area of Science:

Optical metrology
Surface characterization
Holography

Background:

Accurate testing of technical surfaces is crucial for quality control.
Existing interferometry methods may have limitations in sensitivity or application scope.
Macroscopic surface deviations require specialized measurement techniques.

Purpose of the Study:

To describe a new grazing-incidence interferometer for technical surface testing.
To demonstrate the use of computer-generated holograms in interferometry.
To achieve high-precision measurements of surface profiles.

Main Methods:

Development of a grazing-incidence interferometer.
Utilization of computer-generated holograms as beam splitters and references.
Application of phase-stepping techniques for data acquisition.
Testing on a convex rod object to demonstrate capability.

Main Results:

The interferometer successfully measures macroscopic surface deviations.
Sensitivity is tunable via computer-generated hologram periodicity.
Submicrometer precision was achieved across the entire surface of the test sample.
Fast, comprehensive surface measurements were obtained.

Conclusions:

The described grazing-incidence interferometer is effective for high-precision surface testing.
Computer-generated holograms offer a versatile approach for interferometric setups.
The method provides a significant advancement in non-contact surface metrology.