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

Four-wave mixing due to ionization of vapor

Anatoliy I. Khizhnyak, Vladimir B. Markov, Igor Savukov, Tatiana V. Scherbakova

Published Nov 3, 1995• 0 citations
Publisher

Abstract

Several different schemes of four wave mixing (FWM) in resonant media, particularly, using ionized atomic or molecular vapor states, are considered. It is shown that the most efficient process can be achieved with FWM scheme using the ion grating. In this case spatial mismatch between recording interference pattern and light induced grating can be provided, when external electric field is applied to recording non-linear medium.

DOI
10.1117/12.226178

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Several different schemes of four wave mixing (FWM) in resonant media, particularly, using ionized atomic or molecular vapor states, are considered. It is shown that the most efficient process can be achieved with FWM scheme using the ion grating. In this case spatial mismatch between recording interference pattern and light induced grating can be provided, when external electric field is applied to recording non-linear medium.
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The potentialities of diffraction methods for wavefront transformations may be considerably widened due to the use of nonlinear recording of dynamic holograms enabling multiwave mixing in media with the fifth and higher order nonlinearities. There is a great variety of such media including the resonant ones for which the presence of higher order nonlinearities is conditioned by the absorption saturation effect and transitions between different excited states of the molecules. However, in the majority of previous studies of multiwave mixing the resonant medium approximation has been used disregarding the induced anisotropy effect. This work presents a theoretical model and experimental studies of the energy efficiency of multiwave mixing in complex molecular media exhibiting higher order nonlinearities, in two cases: when the nonlinear cavity is introduced in the Fabry-Perot interferometer (IFP), and without it. Owing to the use of different combinations of mutually aligning polarizations for interacting waves, one is enabled to determine the contribution into the interaction efficiency by various dynamic gratings and nonlinearity mechanisms. The role of polarization gratings resultant from spatial modulation of the light field polarization state at the orthogonal polarization of the hologram recording waves has been established. Comparisons between the contributions of the above gratings and “normal” gratings recorded by identically polarized light beams into the process of multiwave mixing have demonstrated that the relation of these contributions is dependent on the intensity of interacting waves, and also it has been found that polarization of the diffracted wave is dependent on the diffraction order.
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