(self)
return self.wavelen/pi/self.w_0
Half of the total angular spread.

        Examples
        ========

        >>> from sympy.physics.gaussopt import BeamParameter
        >>> p = BeamParameter(530e-9, 1, w=1e-3)
        >>> p.divergence
        0.00053/pi
Half of the total angular spread.
Half of the total angular spread .
def divergence(self):
        """
        Half of the total angular spread.

        Examples
        ========

        >>> from sympy.physics.gaussopt import BeamParameter
        >>> p = BeamParameter(530e-9, 1, w=1e-3)
        >>> p.divergence
        0.00053/pi
        """
        return self.wavelen/pi/self.w_0
def divergence ( self ) : return self . wavelen / pi / self . w_0