Title :
Speckle noise suppression by unbalanced nulling interferometer and adaptive optics
Author :
Yokochi, K. ; Nishikawa, J. ; Murakami, N. ; Abe, L. ; Tamura, M. ; Kurokawa, T.
Author_Institution :
Tokyo Univ. of Agric. & Technol., Koganei, Japan
Abstract :
We carried out a laboratory experiment of a pre-optical system for a stellar coronagraph to suppress stellar speckle noise for direct detection of exo-planets. It consists of an unbalanced nulling interferometer (UNI) and phase and amplitude correction (PAC) system. We observed that a speckle level in the focal plane was successfully suppressed (from 1.8×10−4 to 2.9×10−5) by the virtual wavefront correction of lambda/(100×7.0) rms in the UNI-PAC system.
Keywords :
Adaptive optics; Delta modulation; Dynamic range; Mirrors; Optical interferometry; Optical noise; Optical sensors; Planets; Sagnac interferometers; Speckle;
Conference_Titel :
Lasers and Electro-Optics (CLEO) and Quantum Electronics and Laser Science Conference (QELS), 2010 Conference on
Conference_Location :
San Jose, CA, USA
Print_ISBN :
978-1-55752-890-2
Electronic_ISBN :
978-1-55752-890-2
