grasp2alm.BeamPolar.stokes_rotate

BeamPolar.stokes_rotate()

Rotates \(Q\) and \(U\) Stokes parameters from the co-cross basis to the polar basis.

The \(Q\) and \(U\) Stokes parameters are usually represented in the co-cross basis, where the co-polar direction is aligned with the y-axis (consistent with Ludwig 3 convention). For the purposes of extracting the spherical harmonic coefficients, it is more useful to represent them in the polar basis. Unlike the original LevelS’s method, this function operates on a deepcopy of the input BeamPolar, so it does not perform destructive actions.

Returns:

A new instance of BeamPolar with the rotated stokes beam.

Return type:

BeamPolar