diff --git a/docs/source/run/parameters.rst b/docs/source/run/parameters.rst index 9ffd73c129..0e5e3d0981 100644 --- a/docs/source/run/parameters.rst +++ b/docs/source/run/parameters.rst @@ -914,7 +914,7 @@ Parameters starting with ``lasers.`` apply to all laser pulses, parameters start Spatial chirp at focus. * ``.phi2`` (`float`) optional (default `pi/2`) - The amount of temporal chirp :math:`\phi^{(2)}` at focus (in the lab frame). + Temporal chirp :math:`\phi^{(2)}` at focus. Namely, a wave packet centered on the frequency :math:`(\omega_0 + \delta \omega)` will reach its peak intensity at :math:`z(\delta \omega) = z_0 - c \phi^{(2)} \, \delta \omega`. Thus, a positive :math:`\phi^{(2)}` corresponds to positive chirp, i.e., red part of the spectrum in the front of the pulse and blue part of the spectrum in the back. More specifically, the electric field in the focal plane is of the form: