In the framework of generalized Lorenz-Mie theory, laser beams are described by sets of beam-shape coefficients. The modified localized approximation to evaluate these coefficients for a focused Gaussian beam is presented. A new description of Gaussian beams, called standard beams, is introduced. A comparison is made between the values of the beam-shape coefficients in the framework of the localized approximation and the beam-shape coefficients of standard beams. This comparison leads to new insights concerning the electromagnetic description of laser beams. The relevance of our discussion is enhanced by a demonstration that the localized approximation provides a very satisfactory description of top-hat beams as well.
Gouesbet, Gérard; Lock, James A.; and Gréhan, Gérard, "Partial-Wave Representations of Laser Beams for Use in Light-Scattering Calculations" (1995). Physics Faculty Publications. 11.
Gouesbet, Gérard, James A. Lock, and Gérard Gréhan. "Partial-Wave Representations of Laser Beams for Use in Light-Scattering Calculations." Applied Optics 34 (1995): 2133-2143.
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