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Iterative reverse optimization procedure for calibration of aspheric wave-front measurements on a nonnull
Robert O Gappinger1, John E Greivenkamp
1Jet Propulsion Laboratory, M/S 306-388, 4800 Oak Grove Drive, Pasadena, California 91109, USA. robert.o.grappinger@jpl.nasa.gov
Applied Optics
|October 12, 2004
Summary
Accurate interferometric measurements using nonnull configurations are challenging due to aberrations. This study introduces an iterative reverse optimization method to calibrate these measurements, significantly improving accuracy for complex wavefronts.
Area of Science:
- Optical metrology
- Interferometry
- Wavefront sensing
Background:
- Interferometric measurements in nonnull configurations are susceptible to test-dependent aberrations, reducing accuracy.
- Existing calibration methods may involve sensitive merit function weighting, impacting efficiency and reliability.
Purpose of the Study:
- To describe an iterative reverse optimization process for calibrating nonnull interferometric measurements.
- To enhance the efficiency and robustness of calibration by eliminating sensitive merit function weighting issues.
Main Methods:
- Development of an iterative reverse optimization algorithm tailored for nonnull interferometry.
- Application of the process to calibrate wavefront measurements with significant departures.
Main Results:
- The described process successfully calibrated a nonnull interferometric measurement.
- Achieved high accuracy: 0.16 waves peak-to-valley and 0.02 waves root-mean-square (rms) for a wavefront with over 200 waves of departure.
Conclusions:
- Iterative reverse optimization offers an efficient and reliable method for calibrating nonnull interferometric measurements.
- The technique effectively handles complex wavefronts with large departures, achieving high precision.