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method to generate non zero orbital angular momentum of light

Discussion in 'Electronic Design' started by Jamie M, Jan 12, 2013.

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  1. Jamie M

    Jamie M Guest

    Hi,

    This paper shows the setup for generating a light beam with variable
    OAM, using a variable phase delay box:

    http://www.seas.harvard.edu/capasso/wp-content/uploads/publications/ncomms2293.pdf

    I think the way it works is the two coherent beams are polarized 90
    degrees to each other, and then one of them has a phase delay put on
    it, which creates the non zero OAM resultant combined beam. I am not
    100% sure that is how it works, but there is a diagram in the article
    showing the setup. So it takes phase as well as polarization to make a
    "vortex beam" so seems like not a good idea for increasing
    communications bandwidth to me.

    cheers,
    Jamie
     
  2. SoothSayer

    SoothSayer Guest


    Have the current optical bandwidth limits been reached? I thought they
    were not even close to using it up. I have utilized 10Gb/s optical
    switching modules.
     
  3. Jasen Betts

    Jasen Betts Guest

    from that description it sounds a lot like circular polarisation
     
  4. Guest

    Circular polarization is due to light's spin angular momentum; OAM
    is not:

    http://en.wikipedia.org/wiki/Angular_momentum_of_light

    http://en.wikipedia.org/wiki/Light_spin_angular_momentum

    http://en.wikipedia.org/wiki/Light_orbital_angular_momentum

    Check out the diagram on page 3 of your cited document. The fork
    hologram is characteristic of OAM.


    Mark L. Fergerson
     
  5. Jamie M

    Jamie M Guest

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