Abstract
The canonical quantization of a charged particle in an intense laser background is developed and the associated two-point function calculated. It is shown how the causal propagator can be extracted. We provide an interpretation of this propagator in terms of degenerate quantum processes. The spectral properties of the propagator are derived, and we show how multipole structures emerge as a perturbative feature. We also calculate the associated multiple wave-function renormalizations to all orders in perturbation theory. Our calculations are for both circular and linearly polarized plane wave laser backgrounds. DOI: 10.1103/PhysRevD.87.085024