Invention Grant
- Patent Title: Optical birefringence coronagraph
- Patent Title (中): 光学双折射冠
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Application No.: US11637517Application Date: 2006-12-12
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Publication No.: US07715099B2Publication Date: 2010-05-11
- Inventor: Chun-Ching Shih
- Applicant: Chun-Ching Shih
- Applicant Address: US CA Los Angeles
- Assignee: Northrop Grumman Space & Mission Systems Corporation
- Current Assignee: Northrop Grumman Space & Mission Systems Corporation
- Current Assignee Address: US CA Los Angeles
- Agency: Tarolli, Sundheim, Covell & Tummino LLP
- Main IPC: G02B5/30
- IPC: G02B5/30 ; G02B27/28

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.
Public/Granted literature
- US20080137190A1 Optical birefringence coronagraph Public/Granted day:2008-06-12
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