On the basis of two developed and experimentally tested models of gas class A lasers, we consider by what way the
longitudinal magnetic field, multimode operation, competition between active medium and empty cavity anisotropies,
linear coupling, as well as random fluctuations, influence the dynamical behavior of solutions with chiral and achiral
symmetry.
On the basis of elaborated theoretical models of class-A lasers, confirmed in the experiments, new regularities
of vector-field laser dynamics have been established: the mechanism of spontaneous pulsations arising - competition
between active medium and empty cavity anisotropies, the mechanism of arising of complicated (chaotic
and stochastic) oscillations - stochastization of a periodical regime with oscillations of one of the waves near
lasing threshold, the phenomena of polarization and phase symmetry breaking, the effects of polarization-phase
dynamics, reflecting the influence of polarization of electromagnetic wave on its phase.
On the basis of the experimentally confirmed model complemented by symmetry and bifurcation analyses the nonlinear dynamical phenomena have been studied in a single-mode anisotropic-cavity diode-pumped Nd:YAG laser. Bistability of regular and chaotic asymmetric attractors as well as noise-sensitive operation have been revealed.
Complicated (chaotic and stochastic) oscillations have been found in a four-frequency ring gas class-A laser with the linear coupling of the counter-running elliptically polarized waves. The routes to symmetric and asymmetric chaos have been elucidated.
Spontaneous pulsations of intensities, continuous change of instantaneous phase difference between counterrunning waves on π at transition from negative to positive tunings while their mean phase difference remains unaltered as well as jumps on 2π of mean phase differences were found in a four-frequency ring gas class-A laser with elliptically polarized eigenstates in the presence oflinear coupling.
Pitchfork bifurcation of stationary and periodic solutions, reflecting the invariance properties of equations of motion with respect to transformations of variables and parameters and corresponding to polarization symmetry breaking and restoration phenomena have been considered in a single-mode standing-wave class-A gas laser with linear phase anisotropy of the cavity at j yields j + 1 transition between the working levels.
Antiphase chaotic switches and chaotic oscillations of orthogonal linearly polarized eigenstates, influenced by spontaneous emission noise in a single-mode He-Ne laser with anisotropic cavity, have been observed experimentally and explained theoretically. Both of these effects occur in the laser driven by sinusoidal gain modulation across the bifurcation point, which corresponds to the laser first threshold.
On the basis of Jones' vectors and matrices formalism the theoretical study is made of the energy and polarization characteristics of a two-frequency (single-mode) standing-wave Helium-Neon laser with weakly anisotropic cavity possessing linear phase anisotropy. The possibility is shown of the existence of polarization instability of lasers operating at j yields j + 1 transitions. Polarization multistability has been found. The results of the theory are in agreement with the known experimental data.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.