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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. <math>D_2(\omega) = \frac{\partial T_g}{d \omega} = \frac{d^2 \phi}{d\omega^2}</math>. It is a measure of the [[chromatic dispersion]] of the element. A parameter independent of the length of the material is the [[Dispersion (optics)|group velocity dispersion]] (GVD). |