Abstract
The quantum field correlation functions arising in the calculations of multiphoton absorption rate are considered in detail. General expressions of functions, evaluated at two space-time points, are derived forM-mode fields having aP-representation. The normalized correlation functions, taken at one point in the space and time g 1...M (n) (x,t), are investigated in the case of radiation with stationary independent modes. Comparisons between typical fields, thermal, ideal laser, signal plus noise and second harmonic generated by chaotic field, are presented. The influence of the number of modesM on g 1...M (n) (x, t) is numerically discussed. In particular, the limiting values which are reached whenM becomes increasingly large, are examined. A condition is derived, which is sufficient in order that g 1...M () be n! in the limit of an infinite number of independent modes.
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