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Correlations of twin beams generated by parametric down-conversion are quantitatively determined by two-photon counting interferometery. Compared with incoherent light, photon extrabunching at the fs scale is unambiguously and precisely measured.
Frequency doubling of a laser beam in a non-linear crystal has proven to be a very efficient way of accessing new wavelengths. Since it is a nonlinear effect, its efficiency can be improved by inserting the nonlinear medium in a resonant cavity. In this situation the ratio between the output frequency-doubled beam power and the pump power has been measured at values exceeding 80%. However, a single-mode...
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