The real part Re
[
ε
T
]
as a function of
(
δ
−
ω
m
)
/
ω
m
and Ppu (Ppu was 0.04 ×10−3 mW) with different powers of optical pump fields under different situations: η = 1,
ϕ
=
π
(red dashed curve); η = 0 (blue solid curve); η = 1, ϕ = 0 (green dotted curve). The powers of the optical pump fields are Ppu = 0.004 mW, 0.008 mW, 0.04 mW, 0.08 mW, 0.4 mW, 0.8 mW, 4 mW, 8 mW, respectively. The other parameters are the same as those in Fig. 2.
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