Phase conjugation of vector fields by degenerate four-wave mixing in a Fe-doped LiNbO_3 Qian, Sheng-Xia ; Li, Yongnan ; Kong, Ling-Jun ; Tu, Chenghou ; Wang, Hui-Tian Abstract Publication: Optics Letters Pub Date: August 2014 DOI: 10.1364/OL.39.004907 Bibcode: 2014OptL...39.4907Q