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).