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Вестник Красноярского государственного аграрного университета

Применение эффекта когерентного пленения населенностей в газовых средах для создания высокой поляризации на дипольно запрещенных переходах

Д. В. Манушкин

Published Jan 1, 2011• 0 citations
OpenAlex

Abstract

The possibility of creating high polarization on dipole forbidden atomic transition by means of coherent population trapping (CPT) is researched. It is shown that the CPT allows to create the high-limit value of polarization, while the optical transparency of the medium at the lengths of hundreds of times greater than the length of the linear optical absorption.

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Theoretical possibility of huge efficiency increase in nonlinear four-wave transformation on the Raman-type scheme by means of maximum polarization targeting on the dipole forbidden transition of the A system in the use of the effect of coherent population capture is considered in the article. It is shown that in these conditions efficiency can be increased, at least, by seven orders.

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The possibility of creating high polarization on dipole forbidden atomic transition by means of coherent population trapping (CPT) is researched. It is shown that the CPT allows to create the high-limit value of polarization, while the optical transparency of the medium at the lengths of hundreds of times greater than the length of the linear optical absorption.
We study resonant four-wave mixing process (omega) 4 equals (omega) 1 minus (omega) 2 plus (omega) 3 under conditions of coherent population trapping (CPT) when radiations with frequencies (omega) 1,2 are strong, and (omega) 1 minus (omega) 2 equals (omega) 20 ((omega) 20 is a frequency of electrodipole-forbidden transition). It is shown that under the CPT sufficiently large nonlinear polarization (the same as linear polarization or higher) may be created. We show that in atomic Ba vapor for cw lasers quantum conversion efficiency can be as high as several tens percent.
At the conditions of two-photon resonance the effect of coherent population trapping (CPT) can take place. The CPT may be observed as in absorption so in resonance fluorescence. The CPT is widely applied in high resolution spectroscopy, laser cooling, atomic optics and so on. Earlier the peculiarities of CPT resonances on fine structure levels of an atom have been considered on example of thallium atoms. It was shown that the form and number of resonances are influenced by geometry of experiment and initial conditions (initial level populations). As the investigations of CPT on fine structure levels are the object of interest last years, we have considered the numerical analysis of dependence the form of CPT resonances on fine structure levels of T1 atoms as lower levels of Λ-system on polarization of radiation fields. The cases of elliptical, linear and circular polarization have been considered.
The dependence of the shape of resonances of coherent population trapping (CPT) on magnetic sublevels of thallium atoms, forming a generalized Λ-system with the magnetic sublevels of the fine-structure levels as lower ones, on the polarization of the radiation fields has been numerically studied. The cases of linear, elliptical, and circular polarizations have been considered. The shape and the number of CPT resonances for different polarizations have been compared. It has been concluded that the electromagnetically induced transparency can be changed by changing the polarization properties of the laser radiation. The possibility to decrease the number of observed resonances may be useful in high-resolution spectroscopy.