Nonlinear Resonances Free of Field and Doppler Broadenings

Yu. I. Belousov*, E. V. Podivilov, M. G. Stepanov, and D. A. Shapiro

Institute of Automatics and Electrometry,
Siberian Division, Russian Academy of Sciences, Novosibirsk, 630090 Russia

*e-mail: yura@uic.nsu.ru

Received March 7, 2000

Abstract—For the case where the Rabi frequencies of the guiding fields are much larger than the relaxation
constants but much smaller than the Doppler broadening, it is shown that resonances which are neither field nor
Doppler broadened can appear in the absorption (or gain) spectrum of the probe field. A classification of four-
level systems according to the number of resonances is made for cases where two strong fields interact either
with opposite or adjoining transitions. The conditions under which the number of resonances reaches eight,
while for stationary atoms the maximum number is four, are found. A method is proposed for calculating the
number of resonances in a multilevel system with several strong fields using analysis of the extremum points
of the frequency branches in the velocity–frequency plane. © 2000 MAIK “Nauka/Interperiodica”.

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