avicenna Posted September 7, 2019 Posted September 7, 2019 Say if I have a laser beam. If I shine another laser beam to intersect the first beam, will this first beam be affected?
Strange Posted September 7, 2019 Posted September 7, 2019 No. Although, if they have the same frequency, then you could get constructive or destructive interference: https://en.wikipedia.org/wiki/Wave_interference
avicenna Posted September 7, 2019 Author Posted September 7, 2019 39 minutes ago, Strange said: No. Although, if they have the same frequency, then you could get constructive or destructive interference: https://en.wikipedia.org/wiki/Wave_interference Isn't it strange that light-light do not interact?
Mordred Posted September 7, 2019 Posted September 7, 2019 (edited) Nor really, it's only strange if you think particles as billiard balls. However as shown light can interfere with itself by the dynamics of the wave equations in that link. Light does interact with light in terms of interference. Interference is an interaction. Edited September 7, 2019 by Mordred
swansont Posted September 7, 2019 Posted September 7, 2019 Light can interact with itself (photon-photon scattering) but the energy has to be quite high. Gammas, not light from a laser.
studiot Posted September 7, 2019 Posted September 7, 2019 Quote Can light interact with light in empty space? Who says it can't ? How do you think colour projectors work? Mix red light and green light, what colour light do you get and is that not an interaction?
Strange Posted September 7, 2019 Posted September 7, 2019 9 minutes ago, studiot said: is that not an interaction? I wouldn't say so. The light doesn't interact. It just mixes.
swansont Posted September 7, 2019 Posted September 7, 2019 1 hour ago, studiot said: Who says it can't ? How do you think colour projectors work? Mix red light and green light, what colour light do you get and is that not an interaction? You only get that effect because of the eye. Color perception is not an inherent property of light
studiot Posted September 8, 2019 Posted September 8, 2019 11 hours ago, Strange said: I wouldn't say so. The light doesn't interact. It just mixes. 10 hours ago, swansont said: You only get that effect because of the eye. Color perception is not an inherent property of light "Mix" "Effect" The OP says interact, not interfere. How is an effect not an interaction? If you want interference, what about beat frequencies between nearby radio stations? 17 hours ago, avicenna said: Say if I have a laser beam. If I shine another laser beam to intersect the first beam, will this first beam be affected? The OP asks about light, then laser beams. Perhaps the first need is to explain the diference between light in general and laser beams in particular.
Strange Posted September 8, 2019 Posted September 8, 2019 20 minutes ago, studiot said: How is an effect not an interaction? The effect is in the eye and brain. Not between the photons of light. If this is going to turn into another one of your arguments where you insist that a bizarre definition of a word is the only correct one, maybe you should start a new thread. Quote The OP says interact, not interfere. So you think that colour perception in the human visual system (which can happen without the different coloured light being present at the same time) counts as interaction between light beams, but interference between those beams doesn't? 20 minutes ago, studiot said: Perhaps the first need is to explain the diference between light in general and laser beams in particular. Well do that then. 22 minutes ago, studiot said: The OP says interact, not interfere. The OP says, "will this first beam be affected?" Not, "will the photoreceptors of the human eye be affected differently?"
Sensei Posted September 8, 2019 Posted September 8, 2019 Quote Can light photon interact with light photon in empty space vacuum? Yes, they can. It's called two-photon physics. https://en.wikipedia.org/wiki/Two-photon_physics
studiot Posted September 8, 2019 Posted September 8, 2019 (edited) 1 hour ago, Strange said: So you think that colour perception in the human visual system (which can happen without the different coloured light being present at the same time) counts as interaction between light beams, but interference between those beams doesn't? Since you ask this as a question. No. If you insist on only discussing interference between two lasers as an interaction then read this https://www.nature.com/articles/198255a0 Edited September 8, 2019 by studiot
swansont Posted September 8, 2019 Posted September 8, 2019 3 hours ago, studiot said: The OP says interact, not interfere. How is an effect not an interaction? If you want interference, what about beat frequencies between nearby radio stations? The title says in empty space (i.e. a vacuum). The effect involving the eye, and brain, is not in a vacuum. (If you aren’t in a vacuum you can do four-wave mixing in a nonlinear crystal, and get photons at the sum or difference frequency.)
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