Fig. 1. Contours of solutions to the dispersion relations of (a) the fast IAW mode and the slow IAW mode without pump light and (b) the quasimode with strong pump light $I_{0}=1\times 10^{16}~\text{W}/\text{cm}^{2}$. The red line is $\text{Re}[\unicode[STIX]{x1D716}]=0$ and the blue line is $\text{Im}[\unicode[STIX]{x1D716}]=0$. The conditions are $T_{e}=5~\text{keV}$, $T_{i}=0.2T_{e}$, $n_{e}=0.3n_{c}$ and $k_{A}\unicode[STIX]{x1D706}_{De}=0.3$ in a $\text{C}_{2}\text{H}$ plasma.

Fig. 2. Frequency spectrum of $E_{y}$ with the time range $t\in [0,1\times 10^{5}]\unicode[STIX]{x1D714}_{0}^{-1}$ at $x_{0}=25c/\unicode[STIX]{x1D714}_{0}$. The parameters are $n_{e}=0.3n_{c},T_{e}=5~\text{keV},T_{i}=0.2T_{e}$ and $I_{0}=1\times 10^{16}~\text{W}/\text{cm}^{2}$ in a $\text{C}_{2}\text{H}$ plasma, the same as in Figure 1(b).

Fig. 3. (a) Evolution of the SBS reflectivities of different modes with time, where SBS is the total SBS with the frequency range $\unicode[STIX]{x1D714}\in [0.9\unicode[STIX]{x1D714}_{0},0.999\unicode[STIX]{x1D714}_{0}]$, SBS of the fast mode with range $\unicode[STIX]{x1D714}\in [0.9968\unicode[STIX]{x1D714}_{0},0.9977\unicode[STIX]{x1D714}_{0}]$ and SBS of the quasimode with range $\unicode[STIX]{x1D714}\in [0.9960\unicode[STIX]{x1D714}_{0},0.9968\unicode[STIX]{x1D714}_{0}]$. (b) Reflectivity and transmissivity of the total SBS. The condition is the same as in Figure 2.

Fig. 4. Evolution of the SBS reflectivities in different species plasmas with time.

Fig. 5. (a) Early linear stage of SBS in different species plasmas. (b) Relation between the SBS reflectivity and SBS gain in different species plasmas, where the gains in multi-ion species plasmas, such as CH and $\text{C}_{2}\text{H}$ plasmas, are calculated by the kinetic theory, and the gains in single-ion species plasmas, such as H and C plasmas, are calculated by the fluid theory. The SBS reflectivities by the Vlasov simulation take the values at $t=1.3\times 10^{4}\unicode[STIX]{x1D714}_{0}^{-1}$.