A coronagraph system with unbalanced nulling interferometer: progress of dynamic range

Nishikawa, Jun; Yokochi, Kaito; Murakami, Naoshi; Abe, Lyu; Kotani, Takayuki; Tamura, Motohide; Kurokawa, Takashi; Tavrov, Alexander V.; Takeda, Mitsuo; Murakami, Hiroshi

doi:10.1117/12.925792

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2014

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“…The UNI technique is a unique solution to solve the problem with λ/1000 rms optical *jun.nishikawa.naoj.08@gmail.com; phone 81 422 34-3612; fax 81 422 34-3612 quality. We have already published its theory, numerical simulation, application possibility, and experiments before [2][3][4][5][6][7] . In this paper, we describe the principle in short and report new optics being reconstructed according to the improved understandings.…”

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confidence: 98%

A coronagraph system with unbalanced nulling interferometer: progress of optics and control method

et al. 2014

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We have studied a coronagraph system with an unbalanced nulling interferometer (UNI). An important characteristic is a pre-reduction of the star light to 1/100 at the UNI stage which enables to enhance the final contrast. In other point of view, the UNI stage magnifies the wavefront aberrations, which lead us to compensate for the wavefront aberrations beyond the AO systems capabilities. It consists of the UNI, adaptive optics, and a coronagraph. In our experiments, we have observed the extra speckle reduction of better than 0.07 by the advantage of the UNI system. In order to obtain better contrast, we planned to reconstruct all of the optics, which use UNI with 4QPM, a coronagraph with 8OPM or VVM, a dual feedback control method, and a wavefront correction inside the UNI by an upstream AO.

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