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Thread: hologram laser?

  1. #1 hologram laser? 
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    So I have a question that might be hard to describe...

    Is there a form of light (probably laser) which is invisible to the human eye until it comes in contact with another IR laser(or other form of directed light), forming a point of light (visible to the human eye) where the two lasers meet?

    If there is a way to get a point of light to appear in between two light sources, this would be a possibility to create some form of hologram technology.

    I dont understand much about the properties of light, however I thought someone here would probably know a lot more about light and lasers than I do.

    Is what I described above even possible? and if so what might I be able to research to dig deeper into this subject.


    Thank you for your expertise!

    Daniel


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  3. #2  
    Forum Radioactive Isotope MagiMaster's Avatar
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    I've thought of something similar before, but I doubt it'd work so simply. It's possible for two photons to combine, but I think it only happens during interactions with atoms.


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  4. #3  
    . DrRocket's Avatar
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    Quote Originally Posted by MagiMaster
    I've thought of something similar before, but I doubt it'd work so simply. It's possible for two photons to combine, but I think it only happens during interactions with atoms.
    Photons don't interact with one another directly because the photon does not carry an electric charge,

    Photon-photon collisions require extremely high energy and involves a roundabout interaction involving quantum chromodynamics (the strong force).

    Basically, under reasonable conditions you will be able to get photons to combine.
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  5. #4  
    Forum Radioactive Isotope MagiMaster's Avatar
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    What's it called when two photons collide with the same atom before it has time to relax causing it to release a photon of twice the energy? (I imagine that only happens for very specific wavelengths, and that the released photon would have a very specific direction, making this less useful than it might first appear.)
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  6. #5  
    . DrRocket's Avatar
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    Quote Originally Posted by MagiMaster
    What's it called when two photons collide with the same atom before it has time to relax causing it to release a photon of twice the energy? (I imagine that only happens for very specific wavelengths, and that the released photon would have a very specific direction, making this less useful than it might first appear.)
    A photon is released from an atom when an electron changes state, the energy of the photon being equal to the difference in energy between the two states. It is possible to raise the energy of an elecron by first absorbing one photon and then another, in which case upon relaxing to the initial state (in one step) a photon with energy equal to that of the sum of the energies of first two photons would be emitted -- but I am aware of no special name for this.

    There are some obvious variations on this theme.

    There are ways of doing this in which the intermediate state is metastable and the result is a laser.
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