Publication: ApJ; First HAO Author: Alfred de Wijn; Authors as listed in article: A.G. de Wijn, J. de la Cruz Rodríguez, G.B. Scharmer, G. Sliepen, and P. Sütterlin
In 2014 HAO built a polarimetric modulator for the CRISP instrument on the Swedish 1-m Solar Telescope in La Palma, using the principles of polychromatic modulation previously developed by HAO scientists. This paper discusses the processes by which the modulator was designed, built, and tested. The modulator was installed and had been in use since 2015. It is working at close to optimal efficiency and has produced considerable scientific output.