Polarization dynamics in a transverse multimode class b laser: Role of the optical feedback
Autori: Meucci R., De Nicola S., Al Naimee K., Abdalah S.F., Ciszak M., Arecchi F.T.
Affiliazione autori: Istituto Nazionale di Ottica-CNR, Florence, Italy; Istituto Nazionale di Ottica-CNR, Pozzuoli, Italy; INFN Sez.di Napoli, Napoli, Italy; Department of Physics, College of Science, University of Baghdad, Baghdad, Iraq; Dipartimento di Fisica, Università di Firenze, Firenze, Italy
Abstract: We investigate the polarization dynamics in a quasi-isotropic CO2 laser emitting on the annular mode subjected to an optical feedback. We observe a complex dynamics in which spatial mode and polarization competition are involved. The observed dynamics is well reproduced by a model that discriminates between the intrinsic asymmetry due to the kinetic coupling of molecules with different angular momenta and the anisotropy induced by the polarization feedback. We observe various dynamical regimes including chaotic dynamics and show that feedback changes these states from regular to chaotic and vice versa. Such a dynamics is also accompanied by spontaneous between the patterns that indicate the existence of bistability in the system. Finally the possible applications to polarization coding are discussed.
Parole chiavi: Carbon dioxide; Control; Dynamics; Polarization, Chaotic dynamics; Complex dynamics; Dynamical regime; Kinetic coupling; Laser emitting; Polarization coding; Polarization dynamics; Quasi-isotropic, Feedback