Polarization aberrations can limit coronagraphic contrast and can influence engineering choices made for large space telescopes such as the Habitable Worlds Observatory. These engineering choices include primary-secondary mirror distance, splitting of polarization channels, focal plane mask type, and mirror coatings. T...
Daniel N. Shanks, Jaren N. Ashcraft, Richard E. Muller et al.· Journal of Astronomical Tele...· 1 citation
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.· Astronomical Telescopes + In...· 2 citations
This work considers a Machine Learning model trained originally on simulated data, and then augmented with real focus diversity data from the Tiny Observatory for Telescope Optimization (TOTO) testbed at the University of Arizona, and compares the wavefront sensing performance of the Machine Learning model with known t...
Sanchit Sabhlok, Solvay A. Blomquist, M. Kautz et al.· Astronomical Telescopes + In...· 1 citation
NIRC2, the Near Infrared Camera 2 on the Keck II telescope, was recently upgraded with a new suite of polarimetric observing modes. The new polarimetry modes (referred to as NIRC2-Pol) open up a wide range of new studies, including investigations of exoplanets, the Galactic center, active galactic nuclei, and solar sys...
Briley L. Lewis, Man-Xuan Zhang, Maxwell A. Millar-Blanchaer et al.· 3 citations
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...
The Keck/NIRC2 infrared imager was upgraded in 2025 with dual-beam polarimetric observing modes spanning approximately 1.1-4.1 μm (JHKL' bands). We present a preliminary JHK calibration of NIRC2 Polarimetry using a wavelength-dependent Mueller matrix model of the Keck tertiary mirror (M3), half-wave plate (HWP), image...
Man-Xuan Zhang, Briley L. Lewis, Maxwell A. Millar-Blanchaer et al.· Astronomical Telescopes + In...· 1 citation
Phase retrieval techniques are utilized to correct low order wavefront aberrations originating from misalignments of the optical system in space based telescope concepts. Traditional phase retrieval involves observation of the Point Spread Function (PSF) and a diversity measurement, usually focus diversity although oth...
Sanchit Sabhlok, Solvay A. Blomquist, Y. Maggie et al.· 0 citations
Subaru/SCExAO/CHARIS enables near-infrared integral field spectropolarimetry. Quantitative polarimetry is useful for a variety of science cases, particularly measurements related to dust grain properties in circumstellar disks. This capability requires correcting for polarization effects from the optical path via a Mue...
Thomas McIntosh, Man-Xuan Zhang, Briley L. Lewis et al.· Astronomical Telescopes + In...· 2 citations
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