Group delay dispersion

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The group delay dispersion (GDD) of an optical element is the derivative of the group delay with respect to angular frequency, and also the second derivative of the optical phase. D_2(\omega) = -\frac{\partial T_g}{d \omega} = \frac{d^2 \phi}{d\omega^2}. It is a measure of the chromatic dispersion of the element. A parameter independent of the length of the material is the group velocity dispersion (GVD).

Equivalent Parameters[edit]

GDD is related to the total dispersion parameter D as

 D_2(\omega) = -\frac{2\pi c}{\lambda^2}D_{tot}

References[edit]

Encyclopedia of Laser Physics and Technology article on Group Delay Dispersion