Publishing;
and;
Printing;
College,;
Shanghai;
200093,;
China;
of;
Physics;
and;
Information;
Technology,;
Shaanxi;
Normal;
University;
Xi'an;
710062,;
China;
of;
Science,;
University;
of;
Shanghai;
for;
Science;
and;
Technology,;
Shanghai;
200093,;
China;
三能级原子系统; 负折射率; 多色; 连贯性; 驱动场; 三基色; 频率差; 频带;