Apodized Pupil Lyot Coronagraph, Working without Lyot Stop

Details Apodized Pupil Lyot Coronagraph, Working without Lyot Stop Apodized Pupil Lyot Coronagraph, Working without Lyot Stop

Jun 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007lyot.confe..40n&link_type=abstract

Proceedings of the conference In the Spirit of Bernard Lyot: The Direct Detection of Planets and Circumstellar Disks in the 21s

Physics

Optics

Scientific paper

In the context of high dynamic range imaging, the Apodized Pupil Lyot Coronagraph, (APLC), proposed by Soummer (2005), is a combination of an apodization placed in the input pupil, an opaque mask in the following focal plane and a Lyot stop in the coronagraph exit pupil to block the rejected starlight that is left outside the exit pupil. In this work, we propose to leave this Lyot stop off. It is shown that a good bright star extinction can also be reached. This configuration probes to be very interesting for instruments in progress, like FRIDA (inFRared Imager and Dissector for the Adaptive optics system of the Gran Telescopio Canarias), where a stellar coronagraph would be installed. In FRIDA there are some mechanical constraints which prevents from putting a Lyot stop within their second pupil plane, in fact the spectrograph pupil.

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