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The frequency-tunable subthreshold OPO has become aunique source for probing and driving atoms with nonclassical light. Applications span from sub-shot-noise atomic measurements to proposals for the generation of quantum-correlated atomic ensembles. We briefly review the experiments performed to date and then concentrate on the recent results in atomic spin polarization experiments with nonclassical...
The quantum noise of the internally pumped ring optical parametric oscillator is analyzed theoretically. The fundamental field and subharmonics are assumed to be resonator modes, whereas the second harmonic can have an arbitrary detuning. The threshold for parametric oscillations in this system is derived in aplane-wave approximation. The noise spectra for the fundamental and subharmonics below the...
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