Aligna
®
4D User Manual
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As a result, the PSD 4D detector box has to be aligned just coarsely. It can be fixed firmly
without the need of precision alignment mechanics. The exact reference optical axis can be
controlled by electronic signals, instead of fine mechanical alignment!
Of course a 4D lock system needs a little bit higher effort in the electronic system, compared
to a 2D system (two 2D detectors, two actuator mirrors), but:
A 4D stabilization leads to a much more robust and easy to handle system, without the
necessity of mechanical fine alignment and very low mechanical drift!
It compensates for both angle AND position shifting effects.
Both position AND angle will be corrected without optimizing for one of them, without de-
tailed analysis of the movements and drifts.
No fine adjustment of the detectors is necessary.
Aligna
®
4D gives you both possibilities: It can be switched to 2D or to 4D stabilization. Even in
the 2D mode you have the advantage of watching both, position and direction, by help of the
4D detector.
In addition, a 2D stabilization can be performed by a combination movement of all four actua-
tors.
Moreover, the servo speeds may be selected different for angle and position stabilization,
which leads to higher precision, as described later.
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