Invention Grant
US07715099B2 Optical birefringence coronagraph 有权
光学双折射冠

Optical birefringence coronagraph
Abstract:
Systems and methods for attenuating light from undesired sources in a coronagraph apparatus are provided. The coronagraph includes a first imaging lens that receives light representing a desired image and an undesired central image and a reimaging system that mitigates the undesired central image. The reimaging system includes a composite half-wave plate assembly that includes a plurality of angular half-wave plate sections. Each of the plurality of angular half-wave plate sections have two congruent sides that meet at an apex substantially at a center of the composite half-wave plate. A characteristic c-axis associated with a given angular half-wave plate section is aligned differently from the respective characteristic c-axes of at least two angular half-wave plate sections in substantial contact with the two sides of the given angular half-wave plate section. A fixation element engages the half-wave plate sections to maintain the angular half-wave plate sections in a desired arrangement.
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