152 citations · 2.7k across the 105 of their papers we have counts for
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Unusual Stokes V profiles during flaring activity of a delta sunspot
C. E. Fischer, C. U. Keller, F. Snik +2
We analyze a set of full Stokes profile observations of the flaring active region NOAA 10808 recorded with the Vector-Spectromagnetograph (VSM) of the SOLIS facility. We aim to qua…
Innovative Technologies for Optical and Infrared Astronomy
C. R. Cunningham, C. J. Evans, F. Molster +3
Advances in astronomy are often enabled by adoption of new technology. In some instances this is where the technology has been invented specifically for astronomy, but more usually…
M&m's: An error budget and performance simulator code for polarimetric systems
Maria de Juan Ovelar, Frans Snik, Christoph U. Keller
Although different approaches to model a polarimeter's accuracy have been described before, a complete error budgeting tool for polarimetric systems has not been yet developed. Bas…
The Vector-APP: a Broadband Apodizing Phase Plate that yields Complementary PSFs
Frans Snik, Gilles Otten, Matthew Kenworthy +4
The apodizing phase plate (APP) is a solid-state pupil optic that clears out a D-shaped area next to the core of the ensuing PSF. To make the APP more efficient for high-contrast i…
Design of a Full-Stokes Polarimeter for VLT/X-shooter
Frans Snik, Gerard van Harten, Ramon Navarro +3
X-shooter is one of the most popular instruments at the VLT, offering instantaneous spectroscopy from 300 to 2500 nm. We present the design of a single polarimetric unit at the pol…
A compact and robust method for full Stokes spectropolarimetry
William Sparks, Thomas A. Germer, John MacKenty +1
We present an approach to spectropolarimetry which requires neither moving parts nor time dependent modulation, and which offers the prospect of achieving high sensitivity. The tec…