  For the first time, complete source distributions for the emission and
absorption of acoustic and electromagnetic wavelets are defined and computed,
both in spacetime and Fourier space. The biggest surprise is the great
simplicity of the Fourier sources as compared to the rather convoluted
spacetime expressions obtained from the original wavelets. This suggests that
the associated pulsed-beam propagators may play a fundamental role in emission
and absorption processes including focus or "directivity." It also opens the
way to constructing FFT-based algorithms for pulsed-beam analyses of acoustic
and electromagnetic waves.
