• Citer

Moving localized structures and spatial patterns in quadratic media with a saturable absorber

par Tlidi, Mustapha ;Taki, Majid;Le Berre, Martine;Ressayre, Elisabeth;Tallet, Andrée;Di Menza, Laurent
Référence Journal of Optics B: Quantum and Semiclassical Optics (Print Edition), 6, 5, page (421-429)
Publication Publié, 2004

Article révisé par les pairs

• Détails
• Contenu

Résumé :

For near the first lasing threshold, we give a detailed derivation of a real order parameter equation for the degenerate optical parametric oscillator with a saturable absorber. For this regime, we study analytically the role of the quasi-homogeneous neutral mode in the pattern formation process. We show that this effect stabilized the hexagonal patterns below the lasing threshold. More importantly, we find numerically that when Turing and Hopf bifurcations interact, a stable moving asymmetric localized structure with a constant transverse velocity is generated. The formation of the moving localized structures is analysed for both the propagation and the mean field models. A quantitative confrontation of the two models is discussed.