| http://www.w3.org/ns/prov#value | - The fluence distribution (energy per unit area) in the focal plane 40 from such an arrangement of N wave sources is given by: ##EQU4## where ko =2??/??, ?? is the wavelength of the sources associated with the center frequency of the wave packets, r is a vector in the focal plane 40, ni is a unit vector corresponding to the wavevector 42 of beam i, and ui (r) represents the Gaussian complex spatial
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