The Kerr Nonlinearity in an N-Type Four-Level System via Spontaneously Generated Coherence

Figure 2

Linear absorption Im(𝜒⁽¹⁾), dispersion Re(𝜒⁽¹⁾), nonlinear absorption Im(𝜒⁽³⁾), and Kerr nonlinearity Re(𝜒⁽³⁾) as a function of the probe detuning 𝛿 with the different 𝑝. (a), (c), and (e) show the linear absorptions (solid curves) and dispersions (dashed curves); (b), (d), and (f) show the nonlinear absorptions (dashed curves) and Kerr nonlinearities (solid curves). The couples of (a) and (b), (c) and (d), and (e) and (f) are in response to different parameters 𝑝=0,−1, and 1, respectively. The other parameters are set as 𝛾₁=𝛾₂=0.5𝛾₃, Ω_𝐶=Ω_𝑆=0.2𝛾₃, Ω_𝑃=0.01𝛾₃, Δ_𝐶=Δ_𝑆=0, and 𝐶₂=0.1.

(a)

(b)

(c)

(d)

(e)

(f)