Establishment of two-mode lasing in gas lasers

Transient polarization dynamics in a CO2 laser

“…The window W can rotate by an angle θ around the axis V. When θ = 0, the polarization direction is determined by the detuning of the cavity, as usual [2,8,16]. This is illustrated in Fig.…”

“…In particular, the degeneracy of the angular momentum states of the laser transition sublevels has been considered as the coupling source between different polarization states. Initial studies considered only stationary solutions [1,2], but more recently dynamical models have been developed to explore the role of anisotropy due to the laser medium, that from now on we will call intrinsic anisotropy [3,4,5,6]. These models predict a rich dynamics even for the simplest transition, J = 1 → J = 0.…”

“…However, up to now few experiments have been performed on this subject. Experiments carried out on noble gas lasers reveal that in some systems it is necessary to consider the dynamics of the matter variables to fully understand the polarization features of an isotropic system [2,11]. In other cases, the observations could be explained by a nonlinear coupling of the modes and residual cavity anisotropies [13,14].…”

Peculiarities of mode competition in a double-mode diode-pumped Nd:YAG laser

“…15 and 16). Similarly to thoroughly studied analogous regimes in doublemode CO 2 lasers [10], oscillations revealed in mode scanning are associated with the inertial properties of the active medium, i.e., with a time lag between the change in the population of the working levels and variations in the strength of the electromagnetic field in the cavity. Double-mode lasing was implemented within the range of intermode distances 10 MHz < ω 12 < 6 GHz.…”

“…At present there are many publications concerning the mode interaction in gas lasers [4][5][6][7][8][9][10]. However, the problem of the mode interaction in solid-state lasers has received noticeably less attention [11][12][13][14].…”