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Title: The fundamental solution of the unidirectional pulse propagation equation

Journal Article · · Journal of Mathematical Physics
DOI:https://doi.org/10.1063/1.4868698· OSTI ID:22251012
 [1];  [2]
  1. Institute of Mathematics, Humboldt University, Rudower Chaussee 25, 12489 Berlin (Germany)
  2. CEA, DAM, DIF, F-91297 Arpajon (France)

The fundamental solution of a variant of the three-dimensional wave equation known as “unidirectional pulse propagation equation” (UPPE) and its paraxial approximation is obtained. It is shown that the fundamental solution can be presented as a projection of a fundamental solution of the wave equation to some functional subspace. We discuss the degree of equivalence of the UPPE and the wave equation in this respect. In particular, we show that the UPPE, in contrast to the common belief, describes wave propagation in both longitudinal and temporal directions, and, thereby, its fundamental solution possesses a non-causal character.

OSTI ID:
22251012
Journal Information:
Journal of Mathematical Physics, Vol. 55, Issue 3; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-2488
Country of Publication:
United States
Language:
English