THORLABS DMH40-F01, Operation Manual

Page: 9 / 66

© 2021 Thorlabs
2 Operating Principle
4
During the gluing process, a control voltage of 150 V is applied to all segment electrodes. For
this reason, a flat mirror surface will appear at a control voltage level of 150 V, applied to all
segments. At voltages <150 V, the piezo material above the corresponding electrode will ex-
pand, leading to a local concave shape, while a voltage >150 V shrinks the piezo and leads to a
local convex shape:
Applying a voltage to a piezo segment
Applying the same voltage higher or lower than 150 V to all 40 electrodes results in a pure
spherical mirror shape. An arbitrary surface shape can be generated by applying a defined
voltage pattern.
Note
The mirror will be nearly flattened after connecting it to the power supply and to a PC with the
installed Thorlabs Deformable Mirror software! The reason is that the software will initialize the
hardware only after PC connection is made. Whenever no power is connected to the DMH40,
the mirror will be concave (0 V position).