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Modeling the diffraction of a CW (continuous wave), monochromatic (single frequency) field involves the following steps:
#Sampling the complex (real and imaginary components of a) pressure field over a grid of points lying in cross-sectional plane within the field.
#Taking the 2D-FFT (two dimensional [[Fourier Transform]]) of the pressure field contour - this will decompose the field into a 2D "angular spectrum" of component plane waves each traveling in a unique direction.
#Multiplying each point in the 2D-FFT by a propagation term which accounts for the phase change that each plane wave will undergo on its journey to the prediction plane.
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