Abstract
We describe a spectral method for solving the paraxial wave equation in
cylindrical geometry that is based on expansion of the exponential evolution
operator in a Taylor series and use of fast Fourier transforms to evaluate
derivatives. A fourth-order expansion gives excellent agreement with a
two-transverse-dimensional split-operator calculation at a fraction of the cost
in computation time per z step and at a considerable savings in
storage.
© 1989 Optical Society of America
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