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QED and QCD - the basics
Two-photon absorption - Wikipedia
(16) Can 2 photons combine to form 1 photon? If so, how does this go? - Quora
[https://www.quora.com/Can-2-photons-combine-to-form-1-photon-If-so-how-does-this-go] - - public:mzimmerm
Matter creation - Wikipedia
Two-photon physics - Wikipedia
electromagnetic radiation - Is it possible to combine two photons of different energies to get a single photon of a higher (combined) energy? - Physics Stack Exchange
[https://physics.stackexchange.com/questions/360574/is-it-possible-to-combine-two-photons-of-different-energies-to-get-a-single-phot] - - public:mzimmerm
This (and every) answer should make it clear that it is not possible to do this in free space, but occurs in interaction with a material medium.
The Practical Power of Fusing Photons - IEEE Spectrum
(16) Can a photon change direction in a vacuum? - Quora
(16) How do you split a photon into a positron and an electron? What process should the photon go through in order to split into those two particles? - Quora
[https://www.quora.com/How-do-you-split-a-photon-into-a-positron-and-an-electron-What-process-should-the-photon-go-through-in-order-to-split-into-those-two-particles] - - public:mzimmerm