The optimum performance of a photorefractive two‐beam coupling fluence limiter is presented. A two‐level, single‐dopant‐species model is used to determine the minimum transmitted fluence for different crystal dopant densities and incident fluences. The effects on limiter performance for different beam parameters such as the modulation ratio and crossing angle and for different crystal parameters such as the mobility, electro‐optic coefficient, and dielectric constant are determined.