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12 September 2012 Wavefront correction inside unbalanced nulling interferometer
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Abstract
In an unbalanced nulling interferometer (UNI) of our coronagraph system, the incidence light is divided into two, and they interfere by a reverse phase with different amplitude. Thereby, phase errors are magnified and we can correct a wavefront with higher precision. But phase errors of the incident wave will be magnified together with the wavefront errors inside UNI. Now, I am developing a control algorithm of the adaptive optics which removes the wavefront errors inside the interferometer by operating the phase of the light to a suitable value before dividing. In a simulation, wavefront accuracy improved by about 3 times with this technique, and also a comparable effect was acquired experimentally.
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Masaaki Horie, Jun Nishikawa, Masahito Oya, Naoshi Murakami, Lyu Abe, Ryo Waki, Shiomi Kumagai, Motohide Tamura, Takashi Kurokawa, and Hiroshi Murakami "Wavefront correction inside unbalanced nulling interferometer", Proc. SPIE 8445, Optical and Infrared Interferometry III, 84452E (12 September 2012); https://doi.org/10.1117/12.926737
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