Three characteristic features are found . first , for the same set of atom - light interaction parameters , the indices of refraction are large at three different frequencies where the absorption vanishes . these three frequencies are determined by the resonance transition frequencies between dressed states produced by the strong driving field 我們發(fā)現(xiàn)了三個(gè)重要特征:首先,在相同的原子和光相互作用參數(shù)條件下,同時(shí)存在三個(gè)無吸收折射率增強(qiáng)點(diǎn),這三個(gè)點(diǎn)所處的頻率位置由驅(qū)動場產(chǎn)生的修飾態(tài)之間的共振躍遷決定。