  We propose a multi-terminal device consisting of an $s$-wave superconductor
coupled to an altermagnet, to generate highly correlated spin currents via
Cooper pair splitting. Remarkably, we find that the correlated spin currents
are induced by specular Andreev reflections in the altermagnet, an effect that
has up to now been predicted to occur only in a very limited number of systems,
e.g., Dirac/Weyl materials coupled to superconductors. We demonstrate that
positive non-local charge currents and positive noise cross-correlations are
unambiguous fingerprints of the specular Andreev reflections in our proposed
device.
