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Конкретное пленение населенности (КПН)
КПН оптический эффект.

N-resonance
The N-resonance involves the coherent fields and three states, see diagram in the figure . PHYSICAL REVIEW A, VOLUME 65, 043817 Observation of a three-photon electromagnetically induced transparency in hot atomic vapor A. S. Zibrov, C. Y. Ye, Y. V. Rostovtsev, A. B. Matsko, and M. O. Scully