Achromatic deep nulling with a three-dimensional Sagnac interferometer Yokochi, Kaito ; Tavrov, Alexander V. ; Nishikawa, Jun ; Murakami, Naoshi ; Abe, Lyu ; Tamura, Motohide ; Takeda, Mitsuo ; Kurokawa, Takashi Abstract Publication: Optics Letters Pub Date: July 2009 DOI: 10.1364/OL.34.001985 Bibcode: 2009OptL...34.1985Y