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, Masaaki Horie, Jun Nishikawa, Jun Nishikawa, Masahito Oya, Masahito Oya, Naoshi Murakami, Naoshi Murakami, Lyu Abe, Lyu Abe, Ryo Waki, Ryo Waki, Shiomi Kumagai, Shiomi Kumagai, Motohide Tamura, Motohide Tamura, Takashi Kurokawa, Takashi Kurokawa, Hiroshi Murakami, Hiroshi Murakami, } "Wavefront correction inside unbalanced nulling interferometer", Proc. SPIE 8445, Optical and Infrared Interferometry III, 84452E (12 September 2012); doi: 10.1117/12.926737; https://doi.org/10.1117/12.926737
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