New generation multichannel subtractive double pass for EST imaging spectropolarimetry

Abstract

Any future solar telescope project should incorporate an imaging spectrometer. For the future EST (European Solar Telescope) the Observatoire de Paris offers an imaging spectro-porarimetry instrument: a new generation of MSDP. To validate this new generation, we develop a beam slicer prototype that will be tested and validated on optical bench and on existing telescopes. The study assesses the performance gain of such an instrument on a solar 4m class telescope. We present opto-mechanical solutions of a new beam splitter and its implementation in EST.