Accurate astrometry and photometry of saturated and coronagraphic point-spread functions
(PSFs) are fundamental to both ground-and space-based high-contrast imaging projects …

ABSTRACT The Near Infrared Camera and Multi‐Object Spectrometer (NICMOS) aboard
the Hubble Space Telescope (HST) contains optics in Cameras 1 and 2 (NIC1 and NIC2) …

Polarization is a fundamental property of light from astronomical objects, and measuring that
polarization often yields crucial information, which is unobtainable otherwise. This chapter …

The light from extrasolar planets is expected to be partially polarized. The image of an
extrasolar planet can be obtained from its polarized light with a polarization interferometric …

Context. The SPHERE “planet finder” is an extreme adaptive optics (AO) instrument for high
resolution and high contrast observations at the Very Large Telescope (VLT). We describe …

The techniques and components used to measure both linear and circular polarization at
wavelengths from 0.3 ¹m to 20 ¹m are reviewed. Some emphasis is given to the …

EST (European Solar Telescope) is a 4-m class solar telescope, which is currently in the
conceptual design phase. EST will be located at the Canary Islands and aims at …

The speckle polarimeter is a facility instrument of the 2.5-mSAIMSU telescope that combines
the features of a speckle interferometer and a polarimeter. The speckle polarimeter is …

Aims. We investigate the combined point spread function (PSF) of the Broadband Filter
Imager (BFI) and the Solar Optical Telescope (SOT) onboard the Hinode spacecraft …

Abstract Knowledge of the polarization state of radiation provides far more astrophysical
information than intensity alone. Polarimetry has played a key role in the development of …