  We study coherent backscattering of intense laser light from three immobile
two-level atoms using the master equation approach. The master equation is
solved analytically, and the triple scattering spectrum is expressed in
quadratures. We show that this solution can be obtained via a self-consistent
combination of single-atom spectral responses, and is equivalent to the
solution following from the diagrammatic pump-probe approach. We deduce the
general expressions for single-atom building blocks which can be used in
simulations of multiple inelastic scattering of laser light in the bulk atomic
medium.
