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High dynamic range optical system for direct detection of exo-planets by unbalanced nulling interferometer and adaptive optics

We proposed a pre-optical system for a stellar coronagraph to reduce 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 demonstrated a magnification of a wavefront aberration (from λ/138 to λ/21 rms) by the UNI, and correction of the aberration to λ/121 rms by the PAC. We also evaluated nulling performance of a coronagraph with the UNI-PAC system.