Mirror, the reflection coefficient of which is spatially variable in amplitude and phase

摘要

The mirror has a reflective coefficient which can be varied in both amplitude and phase and comprises at least two reflective planes (1,2) which lie parallel to and separate from one another. The mirror planes are linked to a system for varying the distance between them and for deforming at least one of the blades transversely. Each of the two mirror planes is in the shape of a disc, and they are deformed by a fluid under pressure. The discs are made, e.g. from thin layers of silica with multi-dielectric coatings. The first mirror (1) is attached to a mounting (4) by an annular piezoelectric actuator. In a variant the planes can be rectangular or square in shape, and three in number, with two of them being deformable.