The MOI package is a simulation tool on the propagation of partially coherent light in a beamline. It is based on statistical optics and uses mutual optical intensity to describe partially coherent light. It adopts discretization processing and divides the wavefront into a large number of small elements. When the area of the every element is small enough, it satisfies the Fresnel approximation and can analyze the propagation of each elements. Then, the results of all elements are superimposed, Finally, the mutual intensity propagation in free space is obtained.

MOI can provide full coherent information, which includes the optical intensity, statistical phase distribution, wave vector, and coherence between any two points. MOI can not only simulate Gaussian Schell light sources, but also simulate real light sources of free electron lasers, and can directly process the three-dimensional light field of real light sources. Each optical element can be simulated in segments. When a certain optical element changes, there is no need to recalculate the entire beamline from the source, only the element and subsequent parts need to be calculated.

MOI is free for use in scientific research. When publishing articles using MOI results, please cite the following literatures:

1. Numerical analysis of partially coherent radiation at soft x-ray beamline, Xiangyu Meng, Chaofan Xue, Huaina Yu, Yong Wang*, Yanqing Wu*, and Renzhong Tai*, OPTICS EXPRESS, 23 (2015) 29675
2. Mutual optical intensity propagation through non-ideal mirrors, X. Meng, X. Shi*, Y. Wang*, R. Reininger, L. Assoufid and R. Tai*, J. Synchrotron Rad. (2017). 24, 954-962
3. In-plane wavevector distribution in partially coherent X-ray propagation, Junchao Ren, Yong Wang,* Xiangyu Meng, Xianbo Shi,* Lahsen Assoufid and Renzhong Tai*, J. Synchrotron Rad. (2019). 26, 1198–1207 

Authors: Yong Wang, Xiangyu Meng, Junchao Ren, Xianbo Shi and Renzhong Tai

Contact email: wangyong@sari.ac.cn