Group-velocity dispersion in an all-pass Bragg filter.
On the basis of previously performed theoretical analysis it is shown that a slanted volume grating acts as an all-pass filter with nonlinear dispersion when the diffracted wave is evanescent. An analytical expression for the grating transfer function applicable over a wide angular range of mutual orientation of the initial wave and grating vectors is presented. It is demonstrated that group-velocity dispersion (GVD) in an all-pass Bragg filter is a frequency-dependent quasi-periodic function provided that GVD levels are sufficiently high.
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Maksimenko