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中文摘要：
以拉盖尔-高斯（L-G）光束为例,详细研究了单色光束傍轴度的变化.结果表明,模指数、相对束腰宽度等光束参数的变化,通过近轴ABCD光学系统的传输,以及光阑衍射都会引起光束傍轴度的变化.但是,在自由空间中传输时,光束的傍轴度不变.对上述结果以数值计算例加以说明,并用光束傍轴度与远场发散角间的联系做了物理解释.
英文摘要：
Taking the Laguerre-Gaussian（L-G） beam for example,the changes in the degree of paraxiality for monochromatic beams are studied in detail.It is shown that the beam parameters,including mode indiex,relative waist width,propagation through a paraxial ABCD optical system,and diffraction by an aperture may change the degree of paraxiality.But the degree of paraxiality remains unchanged in free-space propagation.The results are illustrated by numerical examples and interpreted in physics by relating the degree of beam paraxiality with the far-field divergence angle.
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