Abstract

An analytical solution of the scalar Helmholtz equation to describe the propagation of a laser light beam in the positive direction of the optical axis is derived. The complex amplitude of such a beam is found to be in direct proportion to the product of two linearly independent solutions of Kummer’s differential equation. Relationships for a particular case of such beams—namely, the Hankel–Bessel (HB) beams—are deduced. The focusing of the HB beams is studied.

© 2012 Optical Society of America

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