Fig. 1. Dependence of peak-to-peak amplitude of $^{85}$Rb $F_g=3\rightarrow F_e=4$~(a) and $^{87}$Rb $F_g=2\rightarrow F_e=3$~(b) on vapor cell temperature. The probe beam intensity $I_{pr}=1.5$$\textrm{m} \text{W}/\textrm{cm}^2$. The pump beam intensity are in the inset of (a) and (b).
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