拉盖尔-高斯光束傍轴度的变化  

Changes in the degree of paraxiality for Laguerre-Gaussian beams

作　　者：崔学才[1] 连校许[1] 吕百达[1] 

机构地区：[1]四川大学激光物理与化学研究所,成都610064

出　　处：《物理学报》2011年第10期280-286,共7页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10874125)资助的课题~~

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.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.

关 键 词：傍轴度 远场发散角 拉盖尔-高斯光束 

分 类 号：O435[机械工程—光学工程]