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 tor all time.
© 1984 Optical Society of America
P. A. Bélanger, "Packetlike solutions of the homogeneous-wave equation," J. Opt. Soc. Am. A 1, 723-724 (1984)