Electromagnetically induced grating in a thermal N-type four-level atomic system
Dong Ya-Bin †, Li Jun-Yan, Zhou Zhi-Ying
       

(color online) The diffraction pattern as a function of with (solid curves) and without (dashed curves) phase modulation. (a) T = 0 K, (b) T = 300 K, . Other parameters are the same as those in Fig. 2.