New possibilities of ultrahigh-resolution spectroscopy on the basis of coherent capture of populations of quantum levels

H. Harde, H. Burggraf

А. Ч. Измайлов

A new method of molecular beam spectroscopy with the ultrahigh resolution is theoretically suggested. This method is based on the phenomenon of the coherent population trapping of molecular levels and allows the identification of the overlapping optical lines in complex spectra (typical for polyatomic molecules), even when frequency intervals between the centers of given lines are less than their natural line widths. The theoretical analysis is carried out on the basis of the Schrödinger equation for the three-level molecular A-system interacting with the two-frequency laser radiation. The conditions of the practical realization and possible applications of the suggested spectroscopy method are discussed.

Veniamin P. Chebotayev

H. Javid

A new method of molecular beam spectroscopy with the ultrahigh resolution is theoretically sug- gested. This method is based on the phenomenon of the coherent population trapping of molecular levels and allows the identification of the overlapping optical lines in complex spectra (typical for polyatomic molecules), even when frequency intervals between the centers of given lines are less than their natural line widths. The theoretical analysis is carried out on the basis of the Schrodinger equation for the three-level molecular Λ -sys- tem interacting with the two-frequency laser radiation. The conditions of the practical realization and possible applications of the suggested spectroscopy method are discussed.

J. N. Eckstein

B. D. Agap'ev, M. B. Gornyi, Boris G. Matisov +1 more

Coherent population trapping (CPT) is a technique in ultrahigh-resolution spectroscopy, developed in recent years. It relies on the nonlinear coherent interaction between an atomic system and incident electromagnetic radiation and is followed by an analysis of the fine structure of the response to this interaction, which contains information about the spectral characteristics of the quantum system. The basic physics of CPT are reviewed, and the effects of level relaxation and structure, and of external factors, on CPT dynamics and characteristics are examined. Experimental results confirming the validity of theoretical ideas on CPT are presented. Possible applications of CPT to frequency stabilization, laser cooling of atoms, and so on are discussed.