(self)
return sqrt(self.z_r/pi*self.wavelen)
The beam waist (minimal radius).

        See Also
        ========

        w : the beam radius at `1/e^2` intensity

        Examples
        ========

        >>> from sympy.physics.gaussopt import BeamParameter
        >>> p = BeamParameter(530e-9, 1, w=1e-3)
        >>> p.w_0
        0.00100000000000000
The beam waist (minimal radius).
The beam waist ( minimal radius ) .
def w_0(self):
        """
        The beam waist (minimal radius).

        See Also
        ========

        w : the beam radius at `1/e^2` intensity

        Examples
        ========

        >>> from sympy.physics.gaussopt import BeamParameter
        >>> p = BeamParameter(530e-9, 1, w=1e-3)
        >>> p.w_0
        0.00100000000000000
        """
        return sqrt(self.z_r/pi*self.wavelen)
def w_0 ( self ) : return sqrt ( self . z_r / pi * self . wavelen )