finesse.components.space.Space.ABCD

Space.ABCD(from_node, to_node, direction='x', symbolic=False, copy=True, retboth=False, allow_reverse=False)

Returns the ABCD matrix of the space for the specified coupling.

This is given by,

$$M = \begin{pmatrix} 1 & \frac{L}{n_r} \\ 0 & 1 \end{pmatrix},$$

where $L$ is the length of the space and $n_r$ is the index of refraction.

See Connector.ABCD() for descriptions of parameters, return values and possible exceptions.