Hey guys,(adsbygoogle = window.adsbygoogle || []).push({});

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 =)

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# Nondegenerate two-photon absorption rate

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