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Author

J. Lumbres

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Open access Aug 2026

Digging dark holes on-sky with the self-coherent camera: preliminary results

Current high-contrast imaging instruments are limited by wavefront errors originating from non-common path aberrations (NCPAs) due, for example, to manufacturing errors in the optics and temperature drifts in the system. These create quasi-static speckles in the final science image that are difficult to distinguish fro...

E. Tonucci, S. Haffert, J. Males et al. · 1 citation
Review Aug 2026

Visible-light high-contrast polarimetric imaging with MagAO-X: characterization and initial results

MagAO-X is a visible-light extreme adaptive optics instrument on the 6.5 meter Magellan Clay Telescope, recently upgraded to enable high-contrast polarimetric differential imaging (PDI) in r', i', and z' filters. Polarimetry is a powerful technique for suppressing unpolarized starlight and isolating the faint, polarize...

M. Lucas, L. Close, J. Males et al. · 2 citations
Open access Aug 2026

Comparing real-time optical gain measurement and methods on MagAO-X

A lingering technical challenge for pyramid wavefront sensors (PyWFS) is their change in response between calibration and correction residuals, a quantity known as optical gain (OG). Given the prevalent use of PyWFSs in current and planned high contrast adaptive optics (AO), understanding and reliably measuring OG for...

E. McEwen, J. Males, O. Guyon et al. · 1 citation
Review Aug 2026

Visible-Light High-Contrast Polarimetry with MagAO-X: Characterization and Initial Results

MagAO-X is a visible-light extreme adaptive optics instrument on the 6.5 meter Magellan Clay Telescope, recently upgraded to enable high-contrast polarimetric differential imaging (PDI) in r', i', and z'filters. Polarimetry is a powerful technique for suppressing unpolarized starlight and isolating the faint, polarized...

M. Lucas, L. Close, J. Males et al. · 0 citations
Open access Aug 2026

No need to modulate: on-sky results of a neural network enhanced pyramid wavefront sensor and prospects for the ELTs

One of the main limitations of ground-based extreme adaptive optics systems (XAO) is the balance between the temporal and photon noise error. The unmodulated Pyramid Wavefront Sensor (uPWFS) promises significant gains in sensitivity over its modulated counterpart, but its practical use is limited by its linearity range...

R. Landman, Liam Koning, S. Haffert et al. · 1 citation

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