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A detailed analysis of the propagation of laser gaussian beams at criticalangles shows in which conditions it is possible to maximize the breaking ofsymmetry in the angular distribution and for which values of the laserwavelength and beam waist is possible to find an analytic formula for angulardeviations of the Snell law. For propagation throughout $N$ dielectric blocksand for a full breaking of symmetry, overcoming the well known problem of theinfinity at critical angle, a closed expression for the Goos-Haenchen shift isobtained. The multiple peaks phenomenon clearly represents an additionalevidence of the breaking of symmetry in the angular distribution of opticalbeams. Finally, laser wavelength and beam waist conditions to produce focaleffects in the outgoing beam are also briefly discussed.

Maximal breaking of symmetry at critical angle and closed form expression for angular deviations of the Snell law