Recently a so-called standard beam description of Gaussian beams was i
ntroduced [J. Opt. Sec. Am. A 11, 2503 (1994)]. However, it was afterw
ard observed [Appl. Opt. 35, 2702 (1996)] that this description exhibi
ts a finite radius of convergence, limiting its range of applicability
. We introduce an improved standard beam description with an infinite
radius of convergence. The utility of this improved description is ill
ustrated by evaluation of radiation pressure forces under severe focus
ing conditions. (C) 1998 Optical Society of America.