Photorefractive grating formulation with any light modulation and excitation: exact and approximate steady-state analytic solutions

Evolution and stability of holographic soliton pairs

“…Then according to the theory of PR two-wave mixing B [14] , and considering an arbitrary modulation depth [15][16][17][18][19] , can be expressed as where is the modulation depth defined by when the background illumination is existent, [15][16][17][18][19] , Γ and are the intensity and phase coupling coefficients for , respectively, expressed as…”