Phase grating and method of fabricating a phase grating

摘要

Phase lattice comprises two spaced reflection layers (2,4)arranged on both sides of a transparent spacer layer (3). The reflection layer (2) is formed as a permanent layer and the reflection layer (4) formed as an amplitude lattice. The novelty is that the spacer layer (3) is provided between parallel facing regions of both reflection layers (2,4) and forms bars which form edges diagonal to the reflection layers (2,4). The refractive index is different on both sides of the edge. Prodn. of the phase lattice is also claimed.