Abstract:The theoretical analysis of the output of a diode face-pumped Nd:YVO 4 slab laser structure with periodic gain is presented, with which in-phased locked output with highly spatially suppressed single-peak intensity distribution could be obtained. We demonstrate respectively that the intensity of the far field distribution with the filling factor of the periodic gain being 60%, 70%, 80%, 90% and obtain a suppressed far-field single peak with barely side-lobes. We discuss the difference of the far-field single-peak intensity distribution between the uniform periodic gain and nonuniform periodic gain, and get the result that the non-uniform periodic gain distribution makes the far-field single-peak rough and asymmetrical. Keywords