A change in the polarization of an ultrashort light pulse is induced by a strong polarized pulse when the two pulses interact with three-level atoms in a gaseous medium with arbitrary values of the momentum. An analysis is made of the possibility of increasing the output signal (i.e., the amplitude of Cartesian component of a probe wave rotated by 90°) by modulation of the input wave phase in accordance with oscillations of a coherent-transient response of the gaseous medium.

Soviet Journal of Quantum ElectronicsSep 30, 19910 citations

Physics Letters A

Quantum effects of polarized light propagation through a two photons absorbing gaseous medium

H.‐H. Ritze, A. Bandilla

Published Sep 1, 1980• 8 citations

Publisher

DOI: 10.1016/0375-9601(80)90420-x

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{\mathrm{F}}_{6}

. The degeneracy of overlapping levels of S

{\mathrm{F}}_{6}

in that spectral region is important, and enables us to use a simple model to describe observed phenomena. We assume a continuous distribution of dipole moments. Results are particularly interesting in two regimes of excitation. One corresponds to very strong excitation and \ensuremath{\sim}20 absorption lengths in the medium: Pulses sharpen at their leading edge, while their front part gets absorbed. The other pertains to much lower excitation and only 2 absorption lengths: Reradiation can be distinguished and long delays result which qualitatively resemble the behavior of a two-level system in self-induced transparency. Fairly conclusive agreement is obtained between a previous theoretical treatment of a homogeneously broadened multilevel medium and experiment. The agreement is substantiated by computer calculations. In three Appendixes we present the observation of focusing effects, the theory of an experiment related to transient nutation, and some remarks on photon-echo polarization experiments in optically thick media.