  This work is the second part of an investigation aiming at the study of
optical wave equations from a field-theoretic point of view. Here, we study
classical and quantum aspects of scalar fields satisfying the paraxial wave
equation. First, we determine conservation laws for energy, linear and angular
momentum of paraxial fields in a classical context. Then, we proceed with the
quantization of the field. Finally, we compare our result with the traditional
ones.
