Abstract

The single feedback mirror device [1] with Rubidium atoms presents a rich diversity of structures in the profile of the output light beam: close to the intensity threshold, a sequence, that minimizes the free energy (fig. 1)[2], successively displays quasi pattern of eight fold orientational order (fig.2), then patterns with four and two spots in the far Field (two and one mode resp.), as the linear refractive index αℓΔ decreases. For αℓΔ ≈ 4, the degeneracy between the squares and the rhombuses is raised by a fifth order multiple scale analysis (fig.3).

© 1996 IEEE