Revisiting the Borde-Traub focal plane wavefront estimation technique for exoplanet direct imaging
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2024
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866913480822489088 |
|---|---|
| author | Potier, Axel Riggs, A J Eldorado Ruane, Garreth Poon, Phillip K. Noyes, Matthew Allan, Greg W. Walter, Alexander B. Prada, Camilo Mejia Galicher, Raphael Mazoyer, Johan Baudoz, Pierre |
| author_facet | Potier, Axel Riggs, A J Eldorado Ruane, Garreth Poon, Phillip K. Noyes, Matthew Allan, Greg W. Walter, Alexander B. Prada, Camilo Mejia Galicher, Raphael Mazoyer, Johan Baudoz, Pierre |
| contents | Direct imaging of exoplanets relies on complex wavefront sensing and control architectures. In addition to fast adaptive optics systems, most of the future high-contrast imaging instruments will soon be equipped with focal plane wavefront sensing algorithms. These techniques use the science detector to estimate the static and quasi-static aberrations induced by optical manufacturing defects and system thermal variations. Pair-wise probing (PWP) has been the most widely used, especially for space-based application and will be tested at contrast levels of ~1e-9 on-sky along with the future coronagraph instrument onboarding the Roman Space Telescope. This algorithm leans on phase diversities applied on the deformable mirror that are recorded in pairs. A minimum of two pairs of probes are required per bandwidth. An additional unprobed image is also recorded to verify the convergence rate of the correction. Before PWP, Borde & Traub proposed a similar algorithm that takes advantage of the unprobed image in the estimation process to get rid of the pair diversity requirement. In this work, we theoretically show that this latter technique should be more efficient than PWP when the convergence time is not limited by photon noise. We then present its performance and practical limitations on coronagraphic testbeds at JPL and exhibit a first on-sky control of non-common path aberrations with such method on VLT/SPHERE. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_14286 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Revisiting the Borde-Traub focal plane wavefront estimation technique for exoplanet direct imaging Potier, Axel Riggs, A J Eldorado Ruane, Garreth Poon, Phillip K. Noyes, Matthew Allan, Greg W. Walter, Alexander B. Prada, Camilo Mejia Galicher, Raphael Mazoyer, Johan Baudoz, Pierre Instrumentation and Methods for Astrophysics Earth and Planetary Astrophysics Direct imaging of exoplanets relies on complex wavefront sensing and control architectures. In addition to fast adaptive optics systems, most of the future high-contrast imaging instruments will soon be equipped with focal plane wavefront sensing algorithms. These techniques use the science detector to estimate the static and quasi-static aberrations induced by optical manufacturing defects and system thermal variations. Pair-wise probing (PWP) has been the most widely used, especially for space-based application and will be tested at contrast levels of ~1e-9 on-sky along with the future coronagraph instrument onboarding the Roman Space Telescope. This algorithm leans on phase diversities applied on the deformable mirror that are recorded in pairs. A minimum of two pairs of probes are required per bandwidth. An additional unprobed image is also recorded to verify the convergence rate of the correction. Before PWP, Borde & Traub proposed a similar algorithm that takes advantage of the unprobed image in the estimation process to get rid of the pair diversity requirement. In this work, we theoretically show that this latter technique should be more efficient than PWP when the convergence time is not limited by photon noise. We then present its performance and practical limitations on coronagraphic testbeds at JPL and exhibit a first on-sky control of non-common path aberrations with such method on VLT/SPHERE. |
| title | Revisiting the Borde-Traub focal plane wavefront estimation technique for exoplanet direct imaging |
| topic | Instrumentation and Methods for Astrophysics Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2408.14286 |