- To observe nonlinear effects in common used materials, a high-intensity light source is required. You should pay special attention to the input wave amplitude and/or the power level; each model with different parameters may need different input power or amplitude. If the input power is too low, you may not observe the nonlinear phenomenon. If the power is too strong, the nonlinear effect may be over saturable.
- The OptiFDTD takes Lorentz dispersive effect to the nonlinear effect. But it can work independently.
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