Coherently induced grating in refractive index enhanced medium<xref rid="cpb_26_12_124209fn1" ref-type="fn">*</xref> <fn id="cpb_26_12_124209fn1"> <label>*</label> <p>Project supported by the National Natural Science Foundation of China (Grant Nos. 11204367 and 61475191) and the Fundamental Research Funds for the Central Universities, China (Grant Nos. GK201503022 and GK201601008).</p> </fn>

Coherently induced grating in refractive index enhanced medium* *

Project supported by the National Natural Science Foundation of China (Grant Nos. 11204367 and 61475191) and the Fundamental Research Funds for the Central Universities, China (Grant Nos. GK201503022 and GK201601008).

Liu Zhuan-Zhuan, Chen Yu-Yuan, Yuan Jia-Yu, Wan Ren-Gang^†

(color online) Energy level scheme based on a mixture of two species of Λ atomic system driven by three light fields. The initially populated levels are indicated by the dots.