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Taking advantages of ultra-narrow bandwidth and high noise rejectionperformance of the Faraday anomalous dispersion optical filter (FADOF),simultaneously with the coherent amplification of atomic stimulated emission, astimulated amplified Faraday anomalous dispersion optical filter (SAFADOF) atcesium 1470 nm is realized. The SAFADOF is able to significantly amplify veryweak laser signals and reject noise in order to obtain clean signals in strongbackground. Experiment results show that, for a weak signal of 50 pW, the gainfactor can be larger than 25000 (44 dB) within a bandwidth as narrow as 13 MHz.Having this ability to amplify weak signals with low background contribution,the SAFADOF finds outstanding potential applications in weak signal detections.

Atomic optical amplifier with narrow bandwidth optical filtering