The Evolution of Complex Spatial Coherency of Optical Fieldsin Laser Resonators
激光光腔内光场空间相干性的演化

Based on the ideal opening model for the laser reso nator and its coherency modal theory in the space-frequency domain, evolution rules of complex spatial coherency of optical fields in the resonator are investigated by numerical simulations. Taking the incoherent beams with uniform strength which pass through a series of hard-edged apertures as an example, the influences of diffract effects on the evolution of the coherency are investigated, and the evolution procedures of the spatial coherency of optical fields are demonstrated. Results from numerical analyses show that, with increases in the number of reciprocating times of optical fields in the resonator, the complex spatial coherency trend to be completely coherent,while their evolution rules are greatly different for different resonator parameters (such as the mirror surface structure or the mirror surface degree).