Abstract
In Chapters 6–8, we will describe how different orders of nonlinear wave-mixing processes can be generated to coexist in the same multi-level atomic systems and how these different nonlinear optical processes interact with each other. Typically higher-order nonlinear optical processes are much weaker than the lower-order ones, so only the lowest-order non-zero nonlinear optical process is considered. However, as we will show that under certain laser beam configurations and energy-level arrangements, highly efficient four-wave mixing (FWM) and six-wave mixing (SWM) processes can be made to coexist in the same multi-level atomic systems with similar signal intensities. Due to specially-designed interaction schemes between laser beams and multi-level atomic systems, the atomic coherence and the multi-photon quantum interference induced between different atomic transitions play important roles, and the generated FWM and SWM signals can be made to transmit through the same or dual electromagnetically induced transparency (EIT) windows. These coexisting multi-wave mixing (MWM) processes and their relative strengths can be controlled and tuned by the intensities and the frequency detuning of the pump (or dressing) laser beams. In this chapter, co-existing and enhanced FWM and SWM processes in several four-level atomic systems are presented and their underlying physical mechanisms are discussed.
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(2009). Coexistence of MWM Processes via EIT Windows. In: Multi-Wave Mixing Processes. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-89528-2_6
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DOI: https://doi.org/10.1007/978-3-540-89528-2_6
Publisher Name: Springer, Berlin, Heidelberg
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