Physics – Optics
Scientific paper
Apr 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004apj...605..892y&link_type=abstract
The Astrophysical Journal, Volume 605, Issue 2, pp. 892-901.
Physics
Optics
10
Instrumentation: Adaptive Optics, Stars: Planetary Systems, Techniques: Interferometric
Scientific paper
We propose a new approach to direct imaging of extrasolar planets: one-sided phase apodization. It is based on a discovery that an antisymmetric spatial phase modulation pattern imposed over a pupil or a relay plane causes diffracted starlight suppression sufficient for imaging of extrasolar planets. Calculations with specific square-pupil (side D) phase functions, such as φ(x,y)=aln[(1+ɛ)+2x/D(1+ɛ)-2x/D(1+ɛ)+2y/D(1+ɛ)-2y/D],demonstrate annulling in at least one quadrant of the diffraction plane to the contrast level of better than 10-12, with an inner working angle down to 3.5λ/D (with a=3 and ɛ=10-3). Furthermore, our computer experiments show that phase apodization remains effective throughout a broad spectrum (60% of the central wavelength) covering the entire visible-light range. Phase-only modulation has the additional appeal of potential implementation via active segmented or deformable mirrors, thereby combining compensation of random phase aberrations and diffraction halo removal in a single optical element.
Kostinski Alexander B.
Yang Weidong
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