激光光腔内光场空间相干性的演化

基于激光谐振腔的理想开腔模型及其在空间频率域的相干模式理论,通过数值模拟分析了光腔内光场空间相干性的演化规律.以强度均匀的非相干光束为例,考虑了一系列硬边光阑的衍射效应对腔内光场相干性演化的影响,再现了腔内光场空间相干性的演化过程.数值计算结果表明：空间相干性随光场在腔内振荡次数的增加逐渐趋于完全相干,但对不同的光腔参量(如腔镜结构和腔镜面度),空间相干性在腔内的演化规律有很大的区别.

The Evolution of Complex Spatial Coherency of Optical Fieldsin Laser Resonators

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).