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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Polarization properties of coherent signals excited by incoherent light pulses

Решетов Владимир Александрович, Igor V. Yevseyev

Published Sep 26, 1997• 0 citations
Publisher

Abstract

The polarizations of photon echoes and superradiance signals formed by incoherent partially polarized exciting pulses are calculated in case of arbitrary values of the resonant level angular momenta. It is shown that the temporal shape of incoherent photon echoes may reproduce the reversed temporal shape of the first exciting pulse.
DOI
10.1117/12.287713

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In the limit of small exciting light-pulse areas the amplitude and polarization of the tri-level photon echo in gases formed by the exciting pulses with arbitrary shapes are obtained. It is shown that the dependence of the tri-level photon echo signal on the mutual orientation of the exciting pulse polarization vectors may be used to determine the optical coherence-matrix relaxation characteristics for an optically forbidden transition. The conditions under which a tri-level photon echo pulse repeats the shape of each of the exciting pulses are defined. It is proved that the tri-level photon-echo polarization properties do not depend on the shapes of the exciting pulses, either for small light-pulse areas or for the tri-level echo formation on narrow spectral lines.
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The polarization properties and the temporal shapes of the super-radiance pulses formed on degenerate levels are studied theoretically in a semiclassical approximation. The dependence of the super-radiance pulse polarization on the values of the total angular momenta of resonant levels and on the polarization and area of the pumping pulse is examined in detail. Non-linear equations describing the temporal shapes of the super-radiance pulses with different polarizations are obtained. Some examples with low values of angular momenta of the levels are discussed. It is shown that, in general, the temporal shape of the super-radiance pulse differs from hyperbolic secant.
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The equations describing the evolution during the linear-emission period of the electric field of superradiance formed by transitions with partially or totally resolved hyperfine structure are obtained in a semiclassical approximation in the case of arbitrary values of electronic angular momenta of the levels and nuclear spin. These equations are used to analyse the polarization properties of superradiance from the levels initially excited from the ground state by the ultra-short linearly polarized laser pulses with small area.