FWM in One-dimensional Nonlinear Photonic Crystal and Theoretical   Investigation of Parametric Down Conversion Efficiency (Steady State   Analysis)
  We study the light propagation in one-dimensional photonic crystal via nonlinear Four Wave Mixing (FWM) process. The linear and nonlinear refractive indexes are approximated with the first Fourier harmonic term. A system of the nonlinear coupled mode equations (NLCMEs), including pump fields depletion is derived for FWM process and steady state analysis is presented numerically. Also some of important system parameters' effects on FWM process are investigated. It has been shown that, although we have considered pump depletion and used a medium with 3rd order succeptibility which is small compared to the 2nd order succeptibility, conversion efficiency is enhanced at least 100 times to the previous works which had used undepleted pump approximation and amedium with 2nd order succeptibility. 
Maryam Boozarjmehr, Ali Rostami