fix doc error

lasy/profiles/gaussian_profile.py

@@ -63,18 +63,24 @@ class GaussianProfile(CombinedLongitudinalTransverseProfile):
 
     beta : float (in second), optional
         The angular dispersion parameterized by
+
         .. math::
+
             \beta = \frac{d\theta_0}{d\omega}
         Here :math:`\theta_0` is the propagation angle of this component.
 
     phi2 : float (in second^2), optional (default '0')
         The group-delay dispertion parameterized by
+
         .. math::
+
             \phi^{(2)} = \frac{dt}{d\omega}
 
-    zeta : float (in meter * second) optional (defalut '0')
+    zeta : float (in meter * second) optional (default '0')
         The spatio-chirp parameterized by
+
         .. math::
+
          \zeta = \frac{x_0}{d\omega}
         Here :math:`x_0` is the beam center position.
 

lasy/profiles/longitudinal/gaussian_profile.py

@@ -73,6 +73,7 @@ def __init__(self, wavelength, tau, t_peak, cep_phase=0, beta=0, phi2=0, zeta=0,
         self.zeta = zeta
         self.w0 = w0
         self.stc_theta = stc_theta
+        self.k0 = 2.0 * scc.pi/wavelength
         if beta:
             assert (w0 is not None and z_foc is not None),\
             "Both w0 and z_foc should be specified if angular dispersion beta is not 0"
@@ -83,7 +84,7 @@ def __init__(self, wavelength, tau, t_peak, cep_phase=0, beta=0, phi2=0, zeta=0,
                 wavelength is not None
             ), "You need to pass the wavelength, when `z_foc` is non-zero."
             self.z_foc_over_zr = z_foc * wavelength / (np.pi * w0**2)
-            self.k0 = 2.0 * scc.pi/wavelength
+
 
 
     def evaluate(self, t, x=None, y=None):