装校失调对大口径离轴抛物面镜光束聚焦特性的影响  

Influence of Misalignment on Properties of Focused Laser Beam by Large Aperture Off-Axis Parabolic Mirror

作　　者：曾夏辉 Zeng Xiahui(Department of Physics&Electronic Information Engineering,Minjiang University,Fuzhou,Fujian 350108,China)

机构地区：[1]闽江学院物理与电子信息工程学院,福建福州350108

出　　处：《激光与光电子学进展》2021年第11期280-289,共10页Laser & Optoelectronics Progress

基　　金：闽江学院青年学者科研启动项目(Mj9n201602);福建省自然科学基金(2017J01560)。

摘　　要：基于严格的全矢量衍射理论,系统详尽地分析了装校失调对大口径离轴抛物面镜(OAP)光束聚焦特性的影响。研究结果表明,OAP的三维平动及绕z″轴偏离旋转后衍射焦斑形态没有发生改变,只是焦斑中心位置发生了偏移,利用瑞利判据获得了OAP的三维平动及绕z″轴偏离旋转公差的量化关系;当OAP发生绕x″或y″轴偏离旋转时会引起像散、彗差的出现致使衍射焦斑形态发生变化,产生严重畸变,大幅降低焦斑的峰值光强。并详细探讨了衍射焦斑峰值光强下降10%时容许的最大旋转偏离角与OAP离轴参量、光束参量的变化关系。因此,理解装校失调对光束聚焦特性的影响机制及变化关系,可以为OAP的精密调整提供可靠的理论依据。Based on the rigorous full vector diffraction theory, the influence of misalignment on the beam focusing characteristics of large aperture off-axis parabolic mirror(OAP) are analyzed in detail. The results show that the shape of the diffraction focal spot does not change after the translation or revolving of OAP around the z″axis, but the center position of the focal spot shifts. The quantitative relationship between OAP’s three-dimensional translation and rotation deviation around z″ axis is obtained by using Rayleigh criterion. When OAP’s rotation deviation around x″or y″axis occurs, the appearance of astigmatism and coma will cause the shape of diffractive focal spot to change, and the peak intensity of the focal spot is greatly reduced. The relationship between the maximum rotation deviation angle and OAP off-axis parameters and beam parameters is discussed in detail. Therefore,understanding the influence mechanism and variation relationship of misalignment on beam focusing characteristics can provide a reliable theoretical basis for precise adjustment of OAP.

关 键 词：激光光学 光束聚焦 全矢量衍射 离轴抛物面镜 失调 

分 类 号：O439[机械工程—光学工程] TN241[理学—光学]