Acta Optica SinicaNegative Refractive Index in Atomic System Based on Incoherent PumpKang Haixia, 寇军 Kou Jun, 苏雪梅 Su Xuemei, 高锦岳 Gao JinyuePublished Jan 1, 2009• 1 citationPublisherDOI10.3788/aos20092912.3498