Compare Model Drawings, CAD & Specs Type Optic Diameter Motorized Axes Angular Range Thread Type Availability Price
8816-6 Center Mount 25.4 mm 2 ±4° 8-32 and M4 $1,567
8816-8 Center Mount 25.4 mm 2 ±4° 8-32 and M4 $1,567
8817-6-V Vacuum Center Mount 25.4 mm 2 ±4° 8-32 and M4 $2,055
8817-8-V Vacuum Center Mount 25.4 mm 2 ±4° 8-32 and M4 $2,166


Easy-to-Use, Flexible Picomotor Controllers

Our Open-Loop Picomotor controllers and drivers are modular. You can daisy-chain up to 31 drivers together with four channels each, so you can have a network of up to 124 standard Picomotor actuators. You have two interface options with the controller system: hand pad or computer, both providing plug-and-play use. Alternatively, you may choose to use our TTL/Analog Picomotor driver.

Vacuum Compatible Stability™ Mounts

The Stability Picomotor Optical Mount is available in a vacuum compatible version which can be used in vacuum (10-6 Torr) environments.

How the Patented Picomotor Design Works

Picomotor actuators rely on the basic difference between dynamic and static friction. An example of this is the magician's "tablecloth trick," in which a quick pull (low dynamic friction) of the cloth leaves the dishes on the table, while a slow pull (high static friction) would pull the dishes off the table and cause a big mess! Our Picomotor actuator uses the same principle with a threaded jaw, similar to two halves of a split nut, clamped around a precision 80-pitch screw. One jaw is connected to one end of a piezoelectric transducer, and the other jaw is connected to the other end of the transducer. A slow electrical signal applied to the piezo slowly changes the length, causing the two jaws to slide in opposite directions. This slow sliding motion makes the screw turn (static friction). At the end of the transducer motion, a fast electrical signal quickly returns the jaws to their starting positions. Because of the screw’s inertia and low dynamic friction, it remains motionless, holding its position. Simply reversing the order of the fast and slow signals reverses the direction of rotation.

Low Wavefront Distortion

The unique optic-retention system of our Stability mounts uses an axial three-point mounting method to ensure that the distortion in the optic is minimized. This is due not only to the fact that the forces acting on the optic are oriented axially and in line, but also because there are twice as many mounting contact points. The forces that would cause distortion are essentially cut in half, more distributed, and axially opposite to eliminate bending.

0.7 µrad Resolution

Our Picomotor actuators allow for an angular resolution of 0.7 µrad, allowing for very small, controlled movements of your optics. The Picomotor actuator offers the additional advantage of using the integrated knobs for quick, manual adjustment of all axes.

Set-and-Forget Long-Term Stability

The Picomotor actuator moves when voltage is applied to the piezo, changing its length and in turn moving the jaws which turn the screw. When no power is applied, the actuator does not move. You can feel confident that your mount will stay put, even when you power down your system.