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We have obtained packetlike solutions to the free-space homogeneous-wave equation. These solutions are Gaussian Laguerre (or Hermite) beams that propagate in a straight line at a light velocity remaining focused for all time.
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P. A. Bélanger (Sun,) studied this question.
www.synapsesocial.com/papers/6a0e698d4a1f6bc4780430ea — DOI: https://doi.org/10.1364/josaa.1.000723
P. A. Bélanger
Journal of the Optical Society of America A
Université Laval
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