Add to ORKGcD te ob on n nd ic on 0, dex distributions, if it is considered in a reference frame ro velocity scalar in k 0, can assu the pres nonpara solution of the NHE. Helmholtz-type nonparaxiality (2) (3) and alone is shown to result in nontrivial modifications to soliton propagation characteristics. The equivalence of the nonparaxial nonlinear Schrödinger equation and the appropriate NHE was recently noted.5 It permits identification of nonparaxial generalizations of conventional soliton theory as exact analytical Helmholtz bright soliton solutions.6 Physical interpretations6 and analytical properties7 of Helmholtz bright solitons have been described; they permit the development and testing of new nonparaxial beam propagation techniques.