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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


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

    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.

  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:

    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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