Quantum Optics...wave amplitude question

  1. In quantum optics, I've been looking at how one can show electromagnetic field is equivalent to a harmonic oscillator.

    They give the E field as, in one dimension:

    E_x (x,t) = A . cos(wt) . sin(kz) where the symbols have their usual meanings.

    A is given as SQRT[2w^2 / Ve]

    here, w is omega, V volume of cavity, e is permittivity of free space. I cannot find an answer however to where this amplitude A comes from. In two quantum optics books I have looked at, they simply introduce it without explanation.

    Any help??
     
  2. jcsd
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