  The acceleration of polarized electrons, positrons, protons and ions in
strong laser and plasma fields is a very attractive option to obtain polarized
beams in the multi-MeV range. Recently, there has been substantial progress in
the understanding of the dominant mechanisms leading to high degrees of
polarization, in the numerical modelling of these processes and in their
experimental implementation. This review article presents an overview on the
current status of the field, on the concepts of polarized laser-plasma
accelerators and of the beam polarimetry.
