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Fast localized wavefront correction using area-mapped phase-shift interferometry.

Gunnsteinn Hall¹, Gabriel C Spalding, Paul J Campagnola

¹Department of Biomedical Engineering & Laboratory for Optical and Computational Instrumentation, University of Wisconsin - Madison, 1675 Observatory Drive, Madison, Wisconsin 53706, USA.

|August 3, 2011

Summary

We introduce area-mapped phase-shift (AMPS) interferometry for faster wavefront correction. This innovative method is threefold faster than spot-optimized phase-stepping (SOPS) interferometry, especially for demanding applications.

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Area of Science:

Optical Metrology
Wavefront Sensing and Control
Interferometry

Background:

Localized wavefront correction is essential for advanced optical systems.
Existing methods like spot-optimized phase-stepping (SOPS) interferometry have speed limitations.

Purpose of the Study:

To introduce and theoretically validate a novel area-mapped phase-shift (AMPS) interferometry technique.
To experimentally compare the performance of AMPS with SOPS interferometry.

Main Methods:

Development of the theoretical framework for AMPS interferometry.
Experimental implementation and comparison of AMPS and SOPS techniques.
Evaluation of speed and point-spread function (PSF) quality under varying aberration levels.

Main Results:

AMPS interferometry demonstrated a threefold increase in speed compared to SOPS.
Similar point-spread function (PSF) quality was observed for moderate aberrations.
AMPS showed slightly less ideal PSF for larger aberrations but offers significant speed advantages.

Conclusions:

AMPS interferometry presents a significant advancement in speed for localized wavefront correction.
This method is particularly valuable for applications requiring high-speed phase-stepping solutions.
AMPS offers a promising alternative to SOPS where speed is a critical performance metric.