Abstract
To obtain the weak signal light detection from the high background noise, we present a theoretical study on the ultra-narrow bandwidth tunable atomic filter with electromagnetically induced transparency. In a three-level -type atomic system in the rubidium D1 line, the bandwidth of the EIT atomic filter is narrowed to ~. And the single peak transmission of the filter can be up to . Moreover, the transmission wavelength can be tuned by changing the coupling light frequency. This theoretical scheme can also be applied to other alkali atomic systems.
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