A perturbation and iterative perturbation analysis of linearly chirped quasi-periodic structures of medium

factor in planar dielectric waveguides has been formulated. This analysis can be used to calculate the diffraction efficiency and the angular field of view of a given linearly chirped grating structure, for a specific incident beam including the effect of higher orders of diffractions. The numerical example of a

m.m,

and grating groove length = 15 μm is presented.