Do photons of different energies interact with each other?

[sqljunkey]

According to this link photons can interact with each other through the creation of other particles. My questions are do they have to have the same wavelength to be able to interact with one another? Is there a threshold where they start to interact with each other?

 

[sophiecentaur]

Use of the term "dead centre" demands caution about the rest. Where is the 'centre' of a photon? That's a meaningless question.

 

[hilbert2]

According to this link photons can interact with each other through the creation of other particles. My questions are do they have to have the same wavelength to be able to interact with one another? Is there a threshold where they start to interact with each other?

If two photons are approaching each other in a head on collision, it should be possible to find a Lorentz frame where the photon wavelengths are equal (anyone correct me if I'm wrong). So, if this higher order process of photon-photon scattering is possible for photons of same wavelength, then it should be possible with unequal wavelengths too.

 

[sophiecentaur]

a Lorentz frame where the photon wavelengths are equal

How does Heisenberg allow that? If they have 'exactly' the same wavelength the their relative position it totally uncertain.

 

[hilbert2]

How does Heisenberg allow that? If they have 'exactly' the same wavelength the their relative position it totally uncertain.

Yes, you can't produce photons with exactly the same wavelength anyway, but my argument is still probably valid for this purpose.

 

[sophiecentaur]

Is there any recorded evidence of this effect?

 

[sqljunkey]

https://en.wikipedia.org/wiki/Two-photon_physics another link that describes these interactions