Let LL' be the latus rectum through the focus of the  hyperbola$\frac{{\mathrm{x}}^2}{{\mathrm{a}}^2}-\frac{{\mathrm{y}}^2}{{\mathrm{b}}^2}=1$ and, A' be the farther vertex. If $\mathrm{△}{\mathrm{A}}^{\mathrm{\prime }}{\mathrm{LL}}^{\mathrm{\prime }}$ is equilateral, then the eccentricity of the hyperbola is