Hi Mike,
Would you be able to explain how you setup the pulsed light source in FDTD? Did you define the time-domain properties of the source? Or are you setting up a broadband source by specifying the frequency range? But in any case averaging over the spectrum seems reasonable to me. When you changed the amplitude of the source, do you mean you do not see a change in the absolute absorbed power? Can you link an article that you are referencing for including the space charge shielding effect?
Regards,
Amrita
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