Optics, from bottom of telescope (inset A in Fig. 1) to the CRISP. FL = field lens, PCO = polarization calibration optics (not in the beam during normal observations), TM = tip-tilt mirror, DM = deformable mirror, RL = reimaging lens, DC = dichroic beamsplitter, CT = correlation tracker, AO WFS = adaptive optics wavefront sensor, FPI = Fabry-Pérot interferometer, HRE = high resolution etalons, LRE = low resolution etalons, WB = wideband, NBT = narrowband transmitted, NBR = narrowband reflected, LCs = liquid crystal modulators, PBS = polarizing beam splitter.
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