Tavrov AV, Nishikawa J, Tamura M, Abe L, Yokochi K, Kurokawa T, Takeda M. Common-path achromatic interferometer-coronagraph: images from a breadboard demonstrator.
APPLIED OPTICS 2007;
46:6885-95. [PMID:
17906715 DOI:
10.1364/ao.46.006885]
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Abstract
A three-dimensional common-path interferometer is proposed, which can achromatically null out an on-axis source while maintaining the detectability of an off-axis source. A geometric phase in the three-dimensional interferometer introduces an achromatic pi-phase shift to the light from the on-axis source, such that destructive interference nulls out the axial light at one of the ports of the interferometer. Light from the off-axis source, which is exempt from destructive interference, comes out from both ports with equal intensity. The common-path scheme makes the system highly immune to environmental disturbances. In the described experiment, a 6x10(-6) peak-to-peak nulling contrast was obtained.
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