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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 10 — May. 7, 2012
  • pp: 10933–10943

Wide-band coronagraph with sinusoidal phase in the angular direction

Ourui Ma, Qing Cao, and Fanzhen Hou  »View Author Affiliations

Optics Express, Vol. 20, Issue 10, pp. 10933-10943 (2012)

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We suggest a new phase mask coronagraph that can work in a wide band of wavelengths. The phase mask has alternatively sinusoidal and uniform functions in the angular direction. We compare it with the four-quadrant phase mask coronagraph and vortex phase mask coronagraph. Through numerical tests, we find that the new mask gives a deep extinction of star light and has a small inner working angle. It is also shown that this mask has a better performance in chromatism than the others for a wide band of wavelengths.

© 2012 OSA

OCIS Codes
(070.6110) Fourier optics and signal processing : Spatial filtering
(100.2980) Image processing : Image enhancement
(110.2970) Imaging systems : Image detection systems
(110.6770) Imaging systems : Telescopes
(350.1260) Other areas of optics : Astronomical optics

ToC Category:
Imaging Systems

Original Manuscript: February 21, 2012
Revised Manuscript: April 5, 2012
Manuscript Accepted: April 5, 2012
Published: April 26, 2012

Ourui Ma, Qing Cao, and Fanzhen Hou, "Wide-band coronagraph with sinusoidal phase in the angular direction," Opt. Express 20, 10933-10943 (2012)

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