finesse.components.cavity.Cavity.q

property Cavity.q

The eigenmode of the cavity in both planes.

For a single plane, the cavity eigenmode $q_{\mathrm{cav}}$ is computed by solving,

$$C q_{\mathrm{cav}}^2+(D-A)q_{\mathrm{cav}} - B = 0,$$

where $A$, $B$, $C$ and $D$ are the elements of the round-trip ABCD matrix of the cavity for this plane.

Getter:

Returns a numpy.ndarray of the cavity eigenmodes in the tangential and sagittal planes, respectively, where both values are BeamParam instances. (read-only).