The Initial Values node adds initial values for the electric field envelopes for the first and second waves, which can serve as an initial guess for a nonlinear solver. Add more Initial Values nodes from the Physics toolbar.

Enter values or expressions for the initial values of the components of the Electric field envelope, first wave E1 and Electric field envelope, second wave E2 (SI unit: V/m). The default values are 0 V/m. The second wave is applicable if the Wave Vectors are bidirectional.