Laplace transform of a matrix exponential
= Laplace transform of a matrix exponential
On its half-plane of convergence,
$$
\mathcal L\{e^{tA}\}(s)=(sI-A)^{-1}.
$$
Indeed, applying the transform to $y'=Ay$, $y(0)=y_0$, gives $(sI-A)Y=y_0$ for every $y_0$.