An end-to-end system model has been developed to model the performance of a rotating disk reactor-based Chemical Oxygen Iodine Laser (COIL) system. The model consists of a system of nonlinear algebraic equations combined into modules by subsystem and is well suited for system trade studies and subsystem data analysis. The model treats the three main components of the COIL system including the rotating disk oxygen generator, the nozzle/cavity/resonator system and the delivery duct system that connects the two previous systems. The oxygen generator module was developed by linearizing the governing partial differential equations for a wetted wall oxygen generator assuming the O2H- ion concentration is constant across the chlorine/basic hydrogen peroxide reaction zone. The linearized equations are solved analytically and averaged over the flow path to produce a set of nonlinear algebraic equations for chlorine utilization and singlet delta oxygen yield. The output of the oxygen generator is passed to the delivery duct module where the transit loss of O2 (1(Delta) ) and the singlet delta loss during iodine dissociation are determined from analytic solutions of the O2(1(Delta) ) species conservation equation. The model compares favorably with experimental laser performance data over a range of operating variables including chlorine flow and diluent ratios, disk rotation rate, iodine-to-chlorine ratios, nozzle throat area, and resonator outcoupling fractions.