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Journal of Experimental and Theoretical Physics

Dynamic features of interaction between a sequence of ultrashort laser pulses and planar, thin-film microcavities

Vladimir A. Goryachev, Sergey M. Zakharov

Published Nov 1, 1998• 0 citations
Publisher

Abstract

A theory of coherent interaction between a sequence of ultrashort laser pulses and planar, thin-film microcavities in the form of Fabry-Perot resonators containing resonating atoms has been developed. The dynamics of transmission of single laser pulses has been analyzed numerically. Analytic solutions of the problem of four-wave mixing of optical fields separated in time have been obtained in the small-area approximation. The dynamic efficiency of conversion of incident waves to the coherent response field (photon echo) generated in a microcavity can be higher than in the case of a bulk resonant structure. Specific features of photon echo generation in a microcavity for arbitrary “areas” of laser pump pulses are discussed.

DOI
10.1134/1.558752

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A theory of coherent interaction between a sequence of ultrashort laser pulses and planar, thin-film microcavities in the form of Fabry-Perot resonators containing resonating atoms has been developed. The dynamics of transmission of single laser pulses has been analyzed numerically. Analytic solutions of the problem of four-wave mixing of optical fields separated in time have been obtained in the small-area approximation. The dynamic efficiency of conversion of incident waves to the coherent response field (photon echo) generated in a microcavity can be higher than in the case of a bulk resonant structure. Specific features of photon echo generation in a microcavity for arbitrary “areas” of laser pump pulses are discussed.
The problem of the interaction of an ultrashort optical pulse and a thin film of resonant atoms under the conditions of two-photon absorption, third-harmonic generation, and the inverse effect of the latter on the pump pulse via Raman scattering is studied. The fact that the field acting on an atom differs from the macroscopic field in the film is also taken into consideration. It is shown that the polarization of the film undergoes dynamic relaxation even in the absence of irreversible relaxation, suppressing Rabi oscillations and establishing stationary values of the populations of the resonant energy levels and of the polarization of the film at the pump and the third-harmonic frequencies.
Abstract We have studied the nonstationary transmission of two ultrashort laser pulses incident on a thin film. The radiation frequency of one of these pulses is in resonance with the two-photon transition from the ground state of the crystal to the biexciton state, while the other pulse coherently mixes the exciton and biexciton states, leading to strong renormalization of the energy spectrum of the crystal. We have obtained a system of nonlinear equations describing the time evolution of the exciton and biexciton amplitudes and the fields of three pulses transmitted through the film. We have analyzed the effect of amplitudes and widths of incident pulsed and of the time delay between them on the peculiarities of film transmission of these pulses. We have predicted the effect of a substantial time delay in the generation of the pulse transmitted through the film relative to the incident pulse, which is in resonance with the exciton–biexciton transition frequency. The possibility of generation of a precursor, viz., a pulse transmitted through the film sooner than the peak of the incident pulse reaches the film, as well as possibility of generation of a reflected pulse in the absence of the incident pulse, has been proven.
A technique for the numerical simulation of coherent optical responses of the photon echo type formed in resonance media with strong inhomogeneous broadening under the action of femtosecond laser pulses is developed. This approach is based on solving the Maxwell-Bloch equations using the finite-difference time-domain (FDTD) method without application of a fast rotating field and slowly varying envelope approximations. The method can be used to simulate coherent responses in different resonance media with a complex structure of energy levels. The technique was validated using the example of describing experiments on narrowing a photon echo pulse and femtosecond echo processing.