随着同步辐射技术的发展，光源的相干性越来越高，特别是衍射极限环的兴起，更是将同步辐射光源的相干性提高了一个台阶。相干性的提高会使光束在传输中表现出不同的性质，基于几何光学的追迹方法不再适用，需要合适的工具用于相干光束线的设计。

上海光源和美国APS光源合作开发出一款用于部分相干光传输的同步辐射模拟软件—MOI。该软件基于统计光学，利用互强度描述部分相干光，通过合理的数值近似计算互强度经过光束线各光学元件的传播。从互强度可以得到部分相干波前上任一点的强度和波矢方向、任意两点之间的相干度和统计相位差，可以充分描述部分相干光的性质。

MOI是一款免费软件，供科研工作者免费使用。如果使用者在发表的论文或成果中用到了MOI的计算结果，请引用以下文献：

？ OPTICS EXPRESS, 23 (2015) 29675

？ J. Synchrotron Rad. (2017). 24, 954-962

MOI界面

MOI: a software for simulation on propagation of partially coherent beam

MOI is a computer software to calculate the propagation of mutual optical intensity for partially coherent light through beamline developed by SSRF and APS. It's based on statistical optics. The partially coherent wavefront is described by mutual optical intensity. The propagation of mutual optical intensity through the beamline can be numerically calculated with Fresnel approximation. The mutual optical intensity consists of the full coherent information of the wavefront, including the intensity and the in-plane wave vector at any point, the coherent degree and statistical phase difference between any two points.

MOI is a free software. However, the authors retain the copyright to MOI. If the users are submitting articles to scientific journals with the results obtained by using MOI, please cite the references below.

？ OPTICS EXPRESS, 23 (2015) 29675

？ J. Synchrotron Rad. (2017). 24, 954-962

MOI GUI