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I When can Klein-Gordon Equation be used for photon?

  1. Mar 7, 2017 #1


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    Consider the double-slit experiment done with photons from a laser. If one was interested only in computing position (vertical) probability amplitudes and did not care about spin/helicity, could the Klein-Gordon Equation (with mass set to zero) be used?

    Thanks in advance.
    Last edited: Mar 7, 2017
  2. jcsd
  3. Mar 7, 2017 #2


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    The Klein-Gordon equation for a (wave)function reads: ##(\square +m^2) \phi (x) =0 ## and applies for a massive photon, too (massive electromagnetic field). Drop the mass term and you've got the D'Alembert equation (the e-m potential satisfies this equation in the covariant Lorenz gauge).

    Did you read a book about the scalar diffraction theory in optics?
  4. Mar 7, 2017 #3


    Staff: Mentor

    Last edited by a moderator: May 8, 2017
  5. Mar 8, 2017 #4


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    Not yet. Can you recommend a good one?
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