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In nonlinear optics third-order hyperpolarizability of moleculesis often measured by THG(third-harmonic generation) experiments."γ"

So third-order nonlinear susceptibility "X(3)" could be calculated from formula using the value of "γ".

Note that third-order nonlinear susceptibility "X(3)" is the complex number.

However in stimulated raman scattering experiments, the gain coefficient "g" is proportion of the imaginary part of X(3).

My question is :

If third-order hyperpolarizability of molecules "γ" is obtainedby THG method, can this value("γ" ) be used to calculatethe gain coefficient "g" from stimulated raman scattering formula?

or

Is third-order nonlinear susceptibility "X(3)" calculated using the value of third-order hyperpolarizability "γ" by THG method the same with the one used in stimulated raman gain coefficient formula?

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# Third-order hyperpolarizability γ in nonlinear optics

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