finesse.utilities.wigner.wigner_moments_2D_hg¶
- finesse.utilities.wigner.wigner_moments_2D_hg(E, qx, qy, lam=1.064e-06, assume_wigner_matrix_symmetry=True, include_gouy=False)[source]¶
Function for computing the Wigner moments of a set of HG mode amplitudes in a given basis (qx,qy). This function also computes other useful metrics from the Wigner moments such as the M2 (M-squared) and the Wigner basis of a beam.
- Parameters:
- Earray_like
HG mode coefficient matrix. If you have a 1D array of HG mode amplitudes use the E_1D_to_2D method to convert it first.
- qx, qycomplex |
finesse.BeamParam x and y direction complex guassian beam paramters
- lamfloat
wavelength of light used
- include_gouybool
Include Gouy phase in HG normalisation [experimental]
- assume_wigner_matrix_symmetrybool
When True only lower half of the Wigner matrix is calculated
- Returns:
- result
WignerMomentsHG Collection of calculations outputs from Wigner moment calculations
- result
Notes
It should be noted that the Wigner basis calculation and the M2 values along each axis (m2x, m2y) are only valid in the case where the general astigmatic wigner moments of the beam are close to zero. The general astigmatic components of a wigner distribution are xv, vx, yu, uy and potentially xy, yx, uv, vu (not sure about those).