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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 6 — Mar. 14, 2011
  • pp: 4957–4969

Speckle level suppression using an unbalanced nulling interferometer in a high-contrast imaging system

Kaito Yokochi, Naoshi Murakami, Jun Nishikawa, Lyu Abe, Motohide Tamura, Alexander V. Tavrov, Mistuo Takeda, and Takashi Kurokawa  »View Author Affiliations

Optics Express, Vol. 19, Issue 6, pp. 4957-4969 (2011)

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High-contrast imaging systems with a stellar halo suppression level of 10−10 are required for direct detection of Earth-like extra-solar planets. We investigated a novel high-contrast imaging system with an unbalanced nulling interferometer (UNI) followed by phase and amplitude correction (PAC), which not only can reduce starlight but also can suppress the speckle level caused by wavefront aberrations. We successfully demonstrated that wavefront aberrations were sufficiently magnified by the UNI and the magnified aberrations were effectively corrected in amplitude and phase with two deformable mirrors. We confirmed that the suppression level of the speckle pattern with the proposed optics was beyond the limit of the adaptive optics performance.

© 2011 OSA

OCIS Codes
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(260.3160) Physical optics : Interference
(350.1260) Other areas of optics : Astronomical optics
(110.1080) Imaging systems : Active or adaptive optics

ToC Category:
Adaptive Optics

Original Manuscript: January 4, 2011
Revised Manuscript: February 9, 2011
Manuscript Accepted: February 9, 2011
Published: March 1, 2011

Kaito Yokochi, Naoshi Murakami, Jun Nishikawa, Lyu Abe, Motohide Tamura, Alexander V. Tavrov, Mistuo Takeda, and Takashi Kurokawa, "Speckle level suppression using an unbalanced nulling interferometer in a high-contrast imaging system," Opt. Express 19, 4957-4969 (2011)

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