Abstract
This chapter reviews some recent theoretical and experimental studies on resonantly enhanced nonlinear interactions in phase-coherent media (“phaseonium”). Basic physics of resonant enhancement and applications such as efficient optical phase conjugation and nonlinear laser spectroscopy are discussed in the chapter. It suggests an efficient optical parametric oscillator based on population trapped atoms. Such an oscillator has very remarkable properties because it combines high efficiency with wide tunability. It illustrates those efficient nonlinear interactions in phase coherent media can be extended into domains involving just a few interacting light quanta at a time. This indicates that an entire new domain of quantum nonlinear optics is emerging from these studies. The chapter explores that unusually efficient frequency up-conversion using atomic coherence in a cascade system has been observed.
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