The 481 Rotation Stage series is ideal for fine-tuning the angular orientation of any component after rotating it to an approximate angle. The stages feature 360° continuous coarse translation on the precision bored bearing turned by hand and 5° fine adjustment tangentially driven by a micrometer or 100 TPI fine adjustment screw. To activate the fine adjustment, the coarse rotation needs to be locked in place with the thumbscrew. Scale markings indicating every degree and a Vernier with 5 arc min markings are engraved on the side of the stage.

The 481 Series Rotation Stages feature 1.063"-20 threaded central aperture which allows secure mounting of 1.0 in. optic such as waveplates and polarizers using included retaining rings, 0.5 in. optic in Adapter, or 0.5 in. beamsplitting cube in Holder. Glan-Laser Calcite Polarizers can directly thread into the tapped aperture. The 481 stages also come with a solid aperture insert which will provide a centered clearance hole allowing on-axis mounting of optical component supported by an optical post.

The actuators of 481 Series Rotation Stages can be quickly removed by untightening the side clamping screw in the actuator mount, allowing the user to install another type of actuator which best fits the precision requirement of the application. The compatible actuators include adjustment screws of higher TPI such as , differential micrometer , and motorized actuators (, , , ).

The 481 stages can be mounted to optical table by clearance holes in the corner of the base, or to optical post in a vertical orientation by tapped holes on the side of the base plate.

The 481 High-Performance Rotation Stages are compatible with a variety of our linear stages and tip & tilt platforms. They can be combined to provide multi-axis motion and can be easily adapted to fit a specific system's needs.

A vernier scale adds precision to a primary scale reading by showing fractional divisions. To read it, start with the zero mark on the vernier to get the approximate value from the primary scale in degrees. Then find the vernier tick that aligns best with a primary scale tick. Convert that aligned tick from arcminutes to degrees and add it to the primary scale reading.

Left Example:

• Zero mark is just past 352° on the Primary Scale
• Matching line is at 50 arcmin on the Vernier Scale.
• Reading = 352° + 50′ = 352.83°

Right Example:

• Zero mark is just past 147° on the Primary Scale
• Matching line is at 30 arcmin on the Vernier Scale.
• Reading = 147° + 30′ = 147.50°