(self)
return atan2(self.z, self.z_r)
The Gouy phase.

        Examples
        ========

        >>> from sympy.physics.gaussopt import BeamParameter
        >>> p = BeamParameter(530e-9, 1, w=1e-3)
        >>> p.gouy
        atan(0.53/pi)
The Gouy phase.
The Gouy phase .
def gouy(self):
        """
        The Gouy phase.

        Examples
        ========

        >>> from sympy.physics.gaussopt import BeamParameter
        >>> p = BeamParameter(530e-9, 1, w=1e-3)
        >>> p.gouy
        atan(0.53/pi)
        """
        return atan2(self.z, self.z_r)
def gouy ( self ) : return atan2 ( self . z , self . z_r )