Polarization and spatial competition in a transverse multimodeCO2laser

Polarized optical feedback and noise effects on CO2laser polarization dynamics: spatial and temporal behavior

“…The full details of this model have been reported in [10]. By means of this model we reproduce most of the experimental observations reported in the previous section.…”

“…When the induced anisotropy is of the same order of magnitude as that of the optical cavity we can observe a regime of competition between the two orthogonally polarized field components. The polarization dynamics during the switch-on transient of a quasi-isotropic CO 2 laser emitting on the fundamental mode and TEM Ã 01 mode are reported [9,10]. Recently, using a quasi-isotropic CO 2 laser, it has been shown that it is possible to stabilize the emission of one of the two polarization modes by using an optical feedback and commute the polarization by a fast switch in the feedback arm [11].…”

Evolution of the Correlation between Orthogonal Polarization Patterns in Broad-Area Lasers

“…He studied the spatial polarization instabilities close to laser threshold by means of the vector complex Ginzburg-Landau equation for the physical model corresponding to atomic transitions between spin sublevels J 1 and J 0. This type of model has been used by Leyva et al to reproduce successfully the light-polarization dynamics of CO 2 lasers [6], also studied by Taggiasco et al [14]. They observed a doughnutlike intensity profile which consists of a TEM 10 mode polarized along one eigendirection and a TEM 01 mode polarized along the orthogonal eigendirection.…”

“…The interplay of the polarization degrees of freedom can lead to antiphase oscillations between two orthogonal polarization eigenstates in a great variety of lasers, such as fiber lasers [1,2], Nd:YAG lasers [3,4], VCSELs [5], CO 2 lasers [6], and Nd-doped microchip glass lasers [7]. Examples of applications based on polarization dynamics are transmission of encoded information [8,9], heterodyne detection systems [10], Doppler velocimetry [11], and optical microwave systems [12].…”

Controlled generation of rotating vector beams in quasi-isotropic laser

“…When the coupling between the polarization modes is weak and some phase anisotropy is also involved, such two-polarization lasers can operate as dual-frequency devices and reveal a number of useful features for such applications as, e.g., vibrometry [3], optical microwave generation [4] and lidars [5]. Note that polarization dynamics of the quasi-isotropic lasers can be very complicated [6,7], being dependent on the strength of coupling between the orthogonal polarization modes.…”