A convergent Born series for solving the inhomogeneous Helmholtz   equation in arbitrarily large media
  We present a fast method for numerically solving the inhomogeneous Helmholtz equation. Our iterative method is based on the Born series, which we modified to achieve convergence for scattering media of arbitrary size and scattering strength. Compared to pseudospectral time-domain simulations, our modified Born approach is two orders of magnitude faster and nine orders of magnitude more accurate in benchmark tests in 1-dimensional and 2-dimensional systems. 
Gerwin Osnabrugge, Saroch Leedumrongwatthanakun, Ivo M. Vellekoop
physics.comp-ph