Noise figure and photon probability distribution in Coherent Anti-Stokes   Raman Scattering (CARS)
  The noise figure and photon probability distribution are calculated for coherent anti-Stokes Raman scattering (CARS) where an anti-Stokes signal is converted to Stokes. We find that the minimum noise figure is ~ 3dB. 
D. Dimitropoulos, D.R. Solli, R. Claps, B. Jalali