Comparative Study of Light Manipulation in Three-Level Systems Via Spontaneously Generated Coherence and Relative Phase of Laser Fields *

Nguyen Huy Bang,Le Nguyen Mai Anh,Nguyen Tien Dung,Le Van Doai

Fig. 6 (Color online) Variations of the group index$n_{g}$ on relative phase $\varphi{}$ in $\Lambda{}$-type (solid line),Ladder-system (dot-dashed line), V-system (dashed line). The employedparameters are $\eta{}$ = 1, p = 0.9, $\Delta{}$$_{p }$= 0,$\Delta{}$$_{c }$= 0, G$_{p}$$_{ }$= 0.01$\gamma{}$, and$G_{c}$ = 5$\gamma{}$.