finesse.gaussian.BeamParam.S¶
- property BeamParam.S¶
Defocus (wavefront curvature), \(S\), of the Gaussian beam, equivalent to the reciprocal of
BeamParam.Rc
.Computed as,
\[S = \frac{z}{z^2 + z_R^2},\]where \(z\) is the distance to the waist position (given by
BeamParam.z
, orBeamParam.real
) and \(z_R\) is the Rayleigh range (given byBeamParam.zr
, orBeamParam.imag
).Hint
Use
BeamParam.curvature()
to compute the curvature as a function of any of the above dependent arguments.- Getter:
Returns the defocus of the beam parameter. Read-only.