Derived from the standard 8885 Picomotor actuated Pint-Sized Center Mount, 0.5 in. Diameter, New Focus is pleased to introduce an ultrahigh vacuum version. With two UHV rated Picomotor actuators, it allows remote adjustment of the tip and tilt axes which add only 0.5 in. of depth to this 0.5 inch (12.7 mm) diameter mount. The 8885-UHV is designed for use in ultrahigh vacuum applications down to base pressures of 10-9 Torr which eliminates virtual leaks and utilizes materials with low outgassing properties. The outgassing rate of this product is less than 5 ppm of volatile mass at 85°C over three hours. With new implemented Kapton leads, the design virtues of this unit are critical in environments including vacuum ultraviolet (VUV) and extreme ultraviolet (EUV) applications. This pint-sized mount is fully compatible with the posts, pedestals, and mounts you already own.
The UHV Picomotor mirror mounts come with 2 different types of cables:
Center mount versions minimize mount-induced wavefront distortions through an innovative, low-distortional axial clamping technique. UHV Center Mount Picomotor Optical Mounts are available for mounting 0.5, 1-, 2-, 3- and 4-in. mirrors.
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.
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.
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.
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.
With the thick front and rear plates, carbide seats, and optimized stiff springs, Picomotor large aperture mounts provides for smooth, reliable motorized adjustment while maintaining a high level of thermal and mechanical stability.
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