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Springer series in optical sciences/SPringer series in optical sciences

Competition Effects Among Nonlinear Optical Processes

Daniel J. Gauthier, Michelle S. Malcuit, Jeffery J. Maki, Robert W. Boyd

Published Jan 1, 1987• 0 citations
Publisher
DOI
10.1007/978-3-540-47973-4_95

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When a strong near-resonant laser beam propagates through an atomic vapor, it can simultaneously induce several different nonlinear optical processes. In certain restricted conditions, these processes evolve independently of one another, but in general these processes compete. We have observed competition1 between four-wave mixing2 (FWM) and amplified spontaneous emission3 (ASE) and have presented an explanation for this phenomenon based on the solution of the coupled-amplitude equations of nonlinear optics. We extend our previous work by presenting a more detailed theoretical explanation of this effect and evidence that competition of this sort occurs quite generally in nonlinear optical systems.
For the first time, we experimentally study the phase control of the coexisting dressed probe signal, six-wave mixing and fluorescence signals in a five-level K-type atomic system by adjusting the angle between the probe signal and certain coupling beams. Such phase controlling results in a switch between bright and dark states. In addition, by using different hyperfine levels of the K-type atomic system as the ground state, the magnitude of the dressing effect is manipulated. The mechanisms of the three types of nonlinear processes are investigated by changing the frequency detuning and powers of the coupling laser beams. In addition, we study the interference and competition among the involved beams in nonlinear optical processes. Such controllable nonlinear processes could have potential applications in optical communication and quantum information processing.