The principle of coronagraph requires that stray light in coronagraph system must be kept at an extremely low level.
日冕仪的工作特点决定了其对杂散光抑制要求极其严格。
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This week, in Nature, Eugene Serabyn of the Jet Propulsion Laboratory in California and his colleagues describe a stunning implementation of what is known as an optical vortex coronagraph.