Notch‐Filter Masks: Practical Image Masks for Planet‐finding Coronagraphs
Notch‐Filter Masks: Practical Image Masks for Planet‐finding Coronagraphs
An ideal coronagraph with a band-limited image mask can efficiently image off-axis sources while removing identically all of the light from an on-axis source. However, strict mask construction tolerances limit the utility of this technique for directly imaging extrasolar terrestrial planets. We present a variation on the basic band-limited mask …