Hello, I'm studying basic nonlinear optics and I would like to solve a couple doubts about (basic) photon interaction.(adsbygoogle = window.adsbygoogle || []).push({});

Let a monocromatic (of frequency ω) electromagnetic field propagate through a nonlinear medium and let the third(and higher)-order terms in the relation between the polarization density P and the electric field E be negligible.

I've read* that the second harmonic generation is based on two photons of frequency ω combining to produce a photon of frequency 2ω.

I would like to understand the practical meaning of "combining" in this context: perhaps it's like "colliding"?

May anyone help me?

Thanks in advance.

*Saleh, Teich - "Foundamentals of Photonics"

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# Nonlinear optics: second harmonic generation

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