How can calculate the two-photon absorption cross-section and two-photon emission cross-section?

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Azahara Almagro

Have you found a solution? I am interesting to know how I can calculate these values

Raad Sh. Alnayli

I am know how can estimated the nonlinear absorption coefficient

but I am interesting to know how can be two photon absorption which is the third order phenomenons, the discussion will be benefit

Corentin Lefebvre

Dear s.F. Haddawi,

Here are some pictures I made a long time ago about two-photon absorption principle and calculation of absorption TPA cross-section. I hope these latter could help you. Of course, I hope to read better explanations than mine.