  We derive production yields for massive pseudo-scalar and scalar
axion-like-particles (ALPs), through non-linear Compton scattering of an
electron in the background of low- and high-intensity electromagnetic fields.
In particular, we focus on electromagnetic fields from Gaussian plane wave
laser pulses. A detailed study of the angular distributions and effects of the
scalar and pseudo-scalar masses is presented. It is shown that
ultra-relativistic seed electrons can be used to produce scalars and
pseudo-scalars with masses up to the order of the electron mass. We briefly
discuss future applications of this work towards lab-based searches for light
beyond-the-Standard-Model particles.
