Figure 2

Figure 2: This set of figures introduces an abstract form of illustration, which will be used in this document. The top figure shows a typical example taken from the analysis of an optical system: an incident field Ein is reflected and transmitted by a semi-transparent mirror; there might be the possibility of second incident field E in2. The lower left figure shows the abstract form we choose to represent the same system. The lower right figure depicts how this can be extended to include a beam splitter object, which connects two optical axes.