四波混频Autler-Townes分裂中的探测光影响

Probe field effects on Autler-Townes splitting in four-wave mixing

在双Λ-型四波混频系统中,研究了探测光强度对Autler-Townes(AT)分裂效应的影响.随着弱探测光强度增大,由缀饰态共振产生的AT分裂双峰间隔不变,但却逐渐增宽线宽且减弱直至消失;而在强耦合光失谐条件下,不对称地位于单光子共振峰两侧的AT分裂双峰却会逐渐趋于对称分布.详细讨论了探测光场对原子的缀饰影响,提出通过探测光强度可以调控原子两基态之间的有效Raman相干,从而影响AT分裂双峰的特征.

In a double Λ-type four-wave mixing system,the influence of probe field intensity on Autler-Townes(AT)splitting is investigated.As the weak-probe intensity increases,the distance of AT splitting generated from dressed-states resonance remains unchanged,but gradually the line-widths increase and the heights decrease until the doublet disappears.While the strong coupling field is detuned,the AT doublet which is asymmetrically located on both sides of the single-photon resonance peak gradually tends to be showed symmetrically.In this paper,we discuss the probe field effects in detail by using the dressed-state model.It is proposed that the effective Raman coherence between atomic ground-states can be controlled by the probe intensity,thereby affecting the characteristics of AT splitting.