Electronic Resource
Springer
Journal of experimental and theoretical physics
88 (1999), S. 1072-1078
ISSN:
1090-6509
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract This paper analyzes a four-level system interacting with four strong fields with frequencies combining into a cycle. The conditions for coherent population trapping, when a nonabsorbing superposition of states forms, are calculated. It is found that, in contrast to a three-level system, the nonabsorbing state splits, i.e., is realized at two values of the detuning. Such splitting manifests itself as narrow dips in the frequency dependence of the upper-level population. Similar dips are found in the spectrum of the nonlinear susceptibility, which is responsible for the conversion efficiency in the process of four-wave mixing.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1134/1.558894
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