Dean Fraser,

you can not measure with comsol software, but you can do simulations!

your question is not clear.

Thank you for your response. I meant how can I simulate a structure, such that, within certain frequency regimes it displays second harmonic generation?

Furthermore, how can I plot the second harmonic generation?

Only method I have found so far, is to use a nonlinear coupled polarization term in my boundary conditions. I was wondering if there are alternative methods?

Hello, I give you two ideas, maybe work:

1) do a full time-dependent simulation

set one boundary condition as oscillatory (for an interval of time) at your x frequency, let it stop at some time, and look if your 2x frequency appear!

This needs post-processing the results to see all the frequencies you want

2) do a frequency analysis with the 2x frequency, and go looking for its half-harmonic (x).

I think Comsol kernel will like this option, and not going from x to 2x (in frequency mode, I guess it kills all higher frequencies!)

Thanks for the response. I'll look into this tomorrow when I'm back in the office.