52 research outputs found
Coherent responses of resonance atom layer to short optical pulse excitation
Coherent responses of resonance atom layer to short optical pulse excitation
are numerically considered. The inhomogeneous broadening of one-photon
transition, the local field effect, and the substrate dispersion are involved
into analysis. For a certain intensity of incident pulses a strong coherent
interaction in the form of sharp spikes of superradiation is observed in
transmitted radiation. The Lorentz field correction and the substrate
dispersion weaken the effect, providing additional spectral shifts. Specific
features of photon echo in the form of multiple responses to a double or triple
pulse excitation is discussed.Comment: only PDF,15 page
Coherent vector pi-pulse in optical amplifiers
We obtain an exact vector solitary solution for the amplification of an
optical pulse with a time width short compared with both population and
polarization decay time. This dissipative soliton results from the balance
between the gain from inverted resonant two-level atoms and the linear loss of
the host material. We suppose that the excited state of the active centers is
degenerate on the projection of the angular moment. Numerical simulations
demonstrate the stability of these vector dissipative solitons in the presence
of both linear birefringence and group velocity dispersion of the host
material.Comment: pdf 26 page
Coherent vector pi-pulse in optical amplifiers
We obtain an exact linearly polarized vector solitary solution for the amplification of an optical pulse with a time width short compared with both population and polarization decay time. This dissipative soliton results from the balance between the gain from inverted resonant two-level atoms and the linear loss of the host material. We suppose that the excited state of the active centers is degenerate on the projection of the angular momentum, with a symmetric state of inversion. Quite remarkably, we find that after the passing of the pulse, the atomic medium does not return to the ground state, and a finite Zeeman coherence is generated. Numerical simulations demonstrate the stability of vector π solitons with an arbitrary state of elliptical polarization in the presence of both linear birefringence and group-velocity dispersion of the host material
Coherent Amplification of the Short Optical Pulse in a Non-linear Birefringent Medium
The propagation of the solitary waves in the resonant birefringent amplifier with linear losses is considered. The birefringent optical linear medium contains two-level atoms with the upper state degenerated over projection of angular moment. It is assumed that population of resonance levels of atoms is inverted. The steady state pulse of polarized radiation that is vectonal generalization of the known π-pulse was analytically found. Numerical simulations demonstrate the formation dynamics solitary waves originated in birefringent amplifier
On the Possibility of Observing the Effect of Anomalous Neutron Transmission in Predominantly Resonance Absorption by Perfect Crystals of InSb
Thermogravimetric investigation of the chemical compatibility of graphite and metal oxides
- …