Unbalanced nulling interferometer with four-quadrant phase mask

Takuji Kobayashi; Jun Nishikawa; Yosuke Tanaka; Takashi Kurokawa; Ken Kashiwagi; Naoshi Murakami; Naoshi Baba; Nobuyuki Hashimoto

doi:10.1117/12.975179

17 October 2012 Unbalanced nulling interferometer with four-quadrant phase mask

Takuji Kobayashi, Jun Nishikawa, Yosuke Tanaka, Takashi Kurokawa, Ken Kashiwagi, Naoshi Murakami, Naoshi Baba, Nobuyuki Hashimoto

Author Affiliations +

Proceedings Volume 8421, OFS2012 22nd International Conference on Optical Fiber Sensors; 84213D (2012) https://doi.org/10.1117/12.975179
Event: OFS2012 22nd International Conference on Optical Fiber Sensor, 2012, Beijing, China

Abstract

One of the problems for direct observation of extrasolar planets is the speckle noise due to a wave-front error. Therefore, high-accuracy adaptive optics is required for realizing a wavefront quality of λ/10000 rms. An unbalanced nulling interferometer has a possibility to assist high-accuracy correction. In this paper, we propose the interferometer with a four-quadrant phase mask in which an optical path is common. By using the mask, we succeed in stabilizing the interference and taking measurements of wavefront errors with 10-times higher sensitivity. In this way, we expect to construct high-accuracy adaptive optics which is more stable.

Citation Download Citation

Takuji Kobayashi, Jun Nishikawa, Yosuke Tanaka, Takashi Kurokawa, Ken Kashiwagi, Naoshi Murakami, Naoshi Baba, and Nobuyuki Hashimoto "Unbalanced nulling interferometer with four-quadrant phase mask", Proc. SPIE 8421, OFS2012 22nd International Conference on Optical Fiber Sensors, 84213D (17 October 2012); https://doi.org/10.1117/12.975179

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