| 摘要 |
The optical device has at least one diffractive optical element integrated in a transparent material, with the combination of the diffractive optical element and the transparent material providing at least 2 optical functions, e.g. imaging, polarisation, beam splitting, filtering, phase shifting, beam shaping, beam profiling, or sub-aperture formation. The device may have 3 superimposed layers with a pole filter or dely foil acting as the centre layer (18) between 2 transparent carrier layers (19,20). |
