ElecSus: Extension to arbitrary geometry magneto-optics

We present a major update to ElecSus, a computer program and underlying model to calculate the electric susceptibility of an alkali-metal atomic vapour. Knowledge of the electric susceptibility of a medium is essential to predict its absorptive and dispersive properties. In this version we implement several changes which significantly extend the range of applications of ElecSus, the most important of which is support for non-axial magnetic fields (i.e. fields which are not aligned with the light propagation axis). Supporting this change requires a much more general approach to light propagation in the system, which we have now implemented. We exemplify many of these new applications by comparing ElecSus to experimental data. In addition, we have developed a graphical user interface front-end which makes the program much more accessible, and have improved on several other minor areas of the program structure. The previous version of this program (AEVD_v1_0) may be found at http://dx.doi.org/10.1016/j.cpc.2014.11.023.我们推出了ElecSus的重大更新版本。ElecSus是一款用于计算碱金属原子蒸气电极化率的计算机程序，其底层搭载了对应的物理模型。介质的电极化率参数，是预测其吸收与色散特性的核心依据。本版本中，我们对ElecSus进行了多项改进，大幅拓展了其适用范围，其中最关键的更新是新增了对非轴向磁场的支持（即不与光传播轴对齐的磁场）。为实现该功能，我们针对系统内的光传播采用了更为通用的处理方案，目前已完成相关开发。我们通过将ElecSus的计算结果与实验数据进行对比，展示了诸多新增应用场景。此外，我们还开发了图形用户界面（graphical user interface, GUI）前端，大幅降低了程序的使用门槛，并对程序架构的多个细节进行了优化。 该程序的旧版本（AEVD_v1_0）可通过以下链接获取：http://dx.doi.org/10.1016/j.cpc.2014.11.023。