We describe a polarimeter for the near-infrared camera SIRIUS mounted on the IRSF 1.4 m
telescope in South Africa. The polarimeter, SIRPOL, consists of an achromatic (1-2.5 μm) …

We present the stray-light point-spread functions (PSFs) and their inverses we characterized
for the Atmospheric Imaging Assembly (AIA) EUV telescopes on board the Solar Dynamics …

Astronomical spectropolarimetry is performed from the X-ray to the radio regimes of the
electromagnetic spectrum. The following chapter deals with instruments and their …

Three exoplanets around the star HR 8799 have recently been discovered by means of
differential imaging with large telescopes. Bright scattered starlight limits high-contrast …

The Mk4 K-coronameter records polarization brightness images of the solar corona from the
Mauna Loa Solar Observatory, Hawaii, USA. Calibration is required to quantitatively …

Direct observations of exoplanets require a stellar coronagraph to suppress the diffracted
starlight. An Apodizing Phase Plate (APP) coronagraph consists of a carefully designed …

This book provides a unified treatment of the characteristics of telescopes of all types, both
those whose performance is set by geometrical aberrations and the effect of the atmosphere …

Using recent measurements of ultraviolet interstellar polarization, we have examined its
relationship to ultraviolet extinction and to polarization and extinction measurements in the …

We present the first astronomical observations obtained with an apodizing phase plate
(APP). The plate is designed to suppress the stellar diffraction pattern by 5 mag from 2-9λ/D …

Abstract The well-known Fourier Transform relationship between the complex illumination
function and the diffraction pattern of an aperture has been applied to measurements of the …