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Abstract
Results of theoretical researches of the saturated absorption resonance shape in a method of the probing field on V-type of transitions are represented. It is shown that in case of opposite circulary polarized optical fields the resonance is shown in the form of cross, and its form strongly depends on relaxation constants of levels and it can be represented as in the form of a dip, and absorption peak. Thus the peak form has exclusively coherent character. Atomic transitions are offered, on which observation of the given effect is possible.
Highlights
It is shown that in case of opposite circulary polarized optical fields the resonance is shown in the form of cross, and its form strongly depends on relaxation constants of levels and it can be represented as in the form of a dip, and absorption peak
It is known that action of the strong light fields on a resonant medium leads to nonlinear effects which are shown in the form of change of the density populations of resonant levels, splitting of levels and an interference of levels – so-called nonlinear interferential effect (NIEF) as result of simultaneous absorption some photons [1]
The resonance registered in this method in the absorption spectrum of the probing field by the resonant gas medium is shown in the form of a dip on the Doppler line contour and carries generally incoherent character
Summary
It is known that action of the strong light fields on a resonant medium leads to nonlinear effects which are shown in the form of change of the density populations of resonant levels (effect of saturation), splitting of levels and an interference of levels – so-called nonlinear interferential effect (NIEF) as result of simultaneous absorption some photons [1]. In this work we consider quantum system in which in case of the opposite directed light waves the nonlinear resonance having exclusively coherent nature (without a contribution of populated effects) with characteristic for coherent processes by an interferential form of a spectrum can be observed. Such situation is realized in the V-type of transitions the upper state of which has to breaks up only in the bottom state, and light waves have to be circular polarized with the counter direction of rotation of polarization vectors. A number of atomic transitions on which probably experimental observation of a resonance of coherent type is offered
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