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Phase-retrieval-based wavefront metrology for high-contrast coronography: 2. Reconstructions through a shaped pupil apodizer
Phase-retrieval-based wavefront metrology for high-contrast coronography: 2. Reconstructions through a shaped pupil apodizer
We discuss the use of parametric phase-diverse phase retrieval to characterize and optimize the transmitted wavefront of a high-contrast apodized pupil coronagraph with and without an apodizer. We apply our method to correct the transmitted wavefront of the HiCAT (High contrast imager for Complex Aperture Telescopes) coronagraphic testbed. This correction requires a series of calibration steps, which we describe. The correction improves the system wavefront from 16 nm RMS to 3.0 nm RMS for the case where a uniform circular aperture is in place. We further measure the wavefront with the apodizer in place to be 11.7 nm RMS. Improvement to the apodized pupil phase retrieval process is necessary before a correction based on this measurement can be applied.
- California Institute of Technology United States
- Harvard University United States
- French National Centre for Scientific Research France
- Université Paris Diderot France
- Space Telescope Science Institute United States
Microsoft Academic Graph classification: Calibration Parametric statistics Apodization Metrology Optics business.industry business Physics Aperture Phase retrieval Coronagraph law.invention law Wavefront
ACM Computing Classification System: ComputingMilieux_MISCELLANEOUS
[SDU]Sciences of the Universe [physics], [PHYS]Physics [physics]
[SDU]Sciences of the Universe [physics], [PHYS]Physics [physics]
Microsoft Academic Graph classification: Calibration Parametric statistics Apodization Metrology Optics business.industry business Physics Aperture Phase retrieval Coronagraph law.invention law Wavefront
ACM Computing Classification System: ComputingMilieux_MISCELLANEOUS
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- California Institute of Technology United States
- Harvard University United States
- French National Centre for Scientific Research France
- Université Paris Diderot France
- Space Telescope Science Institute United States
We discuss the use of parametric phase-diverse phase retrieval to characterize and optimize the transmitted wavefront of a high-contrast apodized pupil coronagraph with and without an apodizer. We apply our method to correct the transmitted wavefront of the HiCAT (High contrast imager for Complex Aperture Telescopes) coronagraphic testbed. This correction requires a series of calibration steps, which we describe. The correction improves the system wavefront from 16 nm RMS to 3.0 nm RMS for the case where a uniform circular aperture is in place. We further measure the wavefront with the apodizer in place to be 11.7 nm RMS. Improvement to the apodized pupil phase retrieval process is necessary before a correction based on this measurement can be applied.