FILTERING OF 2-PHOTON QUANTUM CORRELATIONS BY OPTICAL CAVITIES - CANCELLATION OF DISPERSIVE EFFECTS

The spectral filtering of a field with strong quantum correlations is studied. The changes in the correlation characteristics of a field, pr oduced by a down converter, passing through a strongly dispersive elem ent like a Fabry-Perot cavity, are calculated. In the special case whe n the central frequency of the idler and signal photons coincides with the resonance frequency of the cavity, there is a cancellation of the dispersive effects of the cavity. Detailed numerical results for the two-photon joint counting rate are presented. The effects of the absor ption in the medium on the two-photon correlations are also discussed.