1. F.De Martini and S.Di Fonzo, Europhysics Letters, 10, 123, 1989
2. R. Loudon, The Quantum Theory of Light, Oxford, 1983, chs.3,6
3. K.Huang, Statistical Mechanics, Wiley, New York, 1963, Ch.9. The photon gas is a unique example of collisionless “ideal gas” if one disregards high-order QED “vacuum-polarization” effects: cfr. C.Itzykson and J.Zuber, Quantum Field Theory, Mc Graw Hill, N.Y., 1980, Ch.3. Note that the BE-partition: (Pnh)be=WBEn!(M-1)!/(n+M-1)! is independent of the occupation-number {ni}
4. The gaussian-noise for sets A,B was generated by reverse-biased Motorola 2N-2369 transistors. For A, the A/Φ-modulator was PCEOD125. For B, PC was Laser metrix 1042. The IF’s Φ-modulator was INRAD 621040. Condition |va(t)|max≤v and then I(t)|≤1/2π was determined by sharp amplifier-saturation. The state of the IF-input field-coherence was determined by standard Hanbury Brown-Twiss StA-BS measurements: coherent-or incoherent-light leads to values of the “degree of 2nd-order-coherence”: g(2)=1 or 2, respectively2
5. D.F. Walls, Am.J.Phys. 45, 952, 1977