Title :
Precise wavefront correction with unbalanced nulling interferometer for direct detection of exo-planet
Author :
Yokochi, K. ; Nishikawa, Jun ; Murakami, Naoshi ; Abe, Lyu ; Kotani, Takayuki ; Tamura, Motohide ; Kurokawa, Takashi ; Tavrov, Alexander V. ; Takeda, Mitsuo
Author_Institution :
Tokyo Univ. of Agric. & Technol., Tokyo
Abstract :
We propose a pre-optical system for a stellar coronagraph to reduce the speckle noise. It consists of an (amplitude-) unbalanced nulling interferometer (UNI) and phase and amplitude correction (PAC) with two deformable mirrors. We have demonstrated that an initial wavefront error of lambda/82 is 3.9 times magnified to lambda/22 by the UNI.
Keywords :
adaptive optics; astronomical telescopes; coronagraphs; light interferometry; mirrors; speckle; stellar radiation; deformable mirror; exo-planet detection; phase-amplitude correction; precise wavefront correction; speckle noise; stellar coronagraph; unbalanced nulling interferometer; Adaptive optics; Collimators; Error correction; Extrasolar planet; Laser beams; Mirrors; Noise reduction; Optical interferometry; Optical noise; Speckle;
Conference_Titel :
Lasers and Electro-Optics - Pacific Rim, 2007. CLEO/Pacific Rim 2007. Conference on
Conference_Location :
Seoul
Print_ISBN :
978-1-4244-1173-3
Electronic_ISBN :
978-1-4244-1174-0
DOI :
10.1109/CLEOPR.2007.4391284
