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Soviet Journal of Quantum Electronics

Interaction of short optical pulses with an inverted thin film consisting of two-level atoms

A. M. Samson, Yu. A. Logvin, Sergei I. Turovets

Published Sep 30, 1990• 13 citations
Publisher

Abstract

Numerical and analytic investigations are made of the reflection and propagation of short optical pulses through an inverted thin film consisting of two-level atoms. An analysis is made of cases where pulses having rectangular, hyperbolic-secant, and Gaussian profiles are incident normally on a thin film. It is shown that, as a result of the initial inversion of the atoms, induced superradiance occurs. The dependences of the parameters of the reflected and transmitted pulses on the characteristics of the incident pulse are determined.

DOI
10.1070/qe1990v020n09abeh007424

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Numerical and analytic investigations are made of the reflection and propagation of short optical pulses through an inverted thin film consisting of two-level atoms. An analysis is made of cases where pulses having rectangular, hyperbolic-secant, and Gaussian profiles are incident normally on a thin film. It is shown that, as a result of the initial inversion of the atoms, induced superradiance occurs. The dependences of the parameters of the reflected and transmitted pulses on the characteristics of the incident pulse are determined.
The refraction of a short pulse by a thin film of atoms at two-photon resonance is numerically considered with the process of third harmonic generation involved in the analysis. It is shown that a light pulse, being refracted by a thin film of resonance atoms, decays into subpulses, whose number is determined by the energy penetrating the film. The process depends on the angle of incidence. The variation on the resonance detuning allows compensation of the Stark effect and creation of preferable conditions for light pulse transmission. The effect of local field is similar in its action to the Stark effect, but its contribution to the frequency shift could be significant only in media with a greater concentration of the resonance atoms.
A refraction of short pulses by a thin film of atoms at two- photon resonance is numerically considered with the process of third harmonic generation involved in analysis. It is shown that a light pulse, being refracted by a tin film of resonance atoms, decays into subpulses, which number is determined by the energy penetrated in the film. The process depends on the angle of incidence. The variation of the resonance detuning allows compensating Stark effect and creating the preferable conditions for light pulse transmission. The effect of local field is similar in its action to the Stark effect, but its contribution to the frequency shift could be significant only in the media with greater concentration of the resonance atoms.
We consider the propagation of extremely short pulses through a dielectric thin film containing resonant atoms (two-level atoms) with permanent dipole. Assuming that the film width is less than the field wavelength, we can solve the wave equation and reduce the problem to a system of generalized Bloch equations describing the resonant atoms. We compute the stationary solutions for a constant irradiation of the film. Superimposing a small amplitude linear wave we calculate the reflection and transmission coefficients. From these, one can then deduce the different parameters of the model. We believe that this technique could be used in experiments to obtain the medium atomic and relaxation parameters.
A theoretical investigation is reported of the coherent nonlinear response of excitons and biexcitons in a thin semiconductor film subjected to resonant laser radiation. It is shown that saturation of an exciton transition results in an abrupt qualitative change in the nature of film transition from the regime of total reflection of the incident pulse at low pump amplitudes to oscillatory reflection at high amplitudes. A new area theorem is derived for ultrashort pulses: it establishes a correspondence between the areas of the incident, transmitted and reflected pulses. Anomalous transmission and reflection is predicted for large values of the nonlinear parameter. The equations of the state, describing bistable behavior of the amplitudes of the fields of the transmitted and reflected radiation, are derived for quasi-cw operation.
We consider the propagation of extremely short pulses through a dielectric thin film containing resonant atoms (two level atoms) with permanent dipole. Assuming that the film width is less than the field wave length, we can solve the wave equation and reduce the problem to a system of generalized Bloch equations describing the resonant atoms. We compute the stationary solutions for a constant irradiation of the film. Superimposing a small amplitude linear wave we compute the reflection and transmission coefficients. From these, one can then deduce the different parameters of the model. We believe this technique could be used in experiments to obtain the medium atomic and relaxation parameters.