Signal-to-noise characteristics of nonlinear optical amplifiers
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In this paper, we present the results of our theoretical and experimental studies of the noise properties of optical amplifiers that operate by means of nonlinear optical gain processes. We pay particular attention to amplifiers that utilize the nonlinear optical response of strongly driven atomic vapors, and we compare the results of our measurements with theoretical predictions for the quantum noise limit of an optical amplifier. Our work focuses on optical amplifiers that utilize the nonlinear optical response of atomic vapors.