Bimorph mirrors are assembled by gluing together two pairs of bi-layers consisting of an active element (zirconate lead titanate PZT ceramic) and a neutral fused silica plate, which is then polished. A specific feature of a bimorph is that the bending mechanism is intrinsic to the mirror.
Advantages of Bimorphs are:
- Up to 32 electrodes available, this allows correction of high spatial frequency errors (a mechanical bender can only correct for the length if one actuator or half the length if
- fitted with two actuators)
- Can correct optical defects from the whole beamline
- Adaptive zonal control
- Compact and lightweight
- No mechanical moving parts
Bimorph mirrors are used on monochromatic beamlines as they are currently limited to low heat loads.
|Length||Up to 1700mm|
|Width||Up to 45mm|
|Slope error||2μrad RMS (no voltage applied)
1μrad RMS (after connection)