激光光束质量因子的研究进展

本文详细分析了各种光场下光束质量M2因子。在不同的场中,A.E.Siegman当初所定义的M2因子,已经有了很大的变化,因而M2因子的特性也与当初不同,不仅M2因子可以大于等于1,而且可以小于1,甚至小于0。其反映的物理意义,也从经典场中的衍射极限倍数,变化为非经典场中的准直性量度以及对空间相干性的某些反映。此外还列举并分析了几种特殊的光束质量因子,最后讨论了M2因子应用的问题并指出了其局限性。

The Research Development of Laser Beam Quality Factor

The beam quality factor(M2) of various fields was analyzed in this paper.In the different optical fields,the beam quality factor that A.E.siegman defined has been greatly promoted.The M2 now also had different Characteristics.It can exceed one or less than one,even it can less than zero.The physical significance of it has changed over from the times-diffraction in the classical field to the alignment measurement and the certain reflection of spatial coherence in the non-classical field.In addition,several special M2f actors were listed and analyzed.Finally,the applications of M2 factors were discussed and its limitations were pointed out.