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21.
This paper investigates the absorptive spectral lines of four-level
atomic system driven by a coupling, probe and microwave fields. Due
to the perturbation of the microwave field, the original
electromagnetically induced transparency is changed to
electromagnetically induced absorption and the absorptive spectral
line can be very narrow. This ultranarrow spectral line has
potential applications to the microwave atomic frequency standard and
the measurement of very weak magnetic field. 相似文献