Nondegenerate two-photon absorption rate

  1. Hey guys,

    a quick one. I've noticed that you can compute the two photon absorption coefficient by
    [itex]\beta = \frac{2 \hbar \omega}{I^2}W[/itex]
    where W is the transition rate for TPA. (wiki link)

    Now my question is what about nondegenerate two photon absorption? by that i mean two different frequencies of light being absorbed, what will be the equation linking beta and W?

    Thanks in advance =)
  2. jcsd
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