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Rotary Mount, 1 inch Waveplates or Polarizers, 8-32 Thread
In Stock
In Stock
Rotary Mount, 1 inch Waveplates or Polarizers, M4 Thread
In Stock
In Stock


  • Optic Diameter
    25.4 mm
  • Angular Range
  • Drive Type
    Removable Lever
  • Clear Aperture
    20.6 mm
  • Material
  • Retaining Ring Thread


Stack Mounts for a Continuously Variable Attenuator

By combining a half-wave plate, a polarizer and two 9401 rotary stages, a continuously variable attenuator that works with any linearly polarized light while maintaining the original input-polarization state can be constructed. The rotation stages mount together using two 1/4-20 (M6) cap screws with nuts, so only the space for one component on the table is needed. With randomly polarized light, two polarizers can be used to make a variable attenuator.

Keep Your Hands Out of Harm's Way

With the lever arm adjuster located on the top of the mount, the optic can be rotated so that your hands never have to enter the beam area. The lever arm can be removed to prevent accidental contact once the position is set, and for long-term stability of the optic's orientation, a set screw locking mechanism is available.

High-Resolution Manual Rotation

With the 9401's Vernier scale for visual guidance and lever arm for smooth, dexterous control, fine manual rotation of 1-in. diameter polarizers or wave plates with 0.1° resolution is possible. For 360° rotation, the lever arm must either be loosened or removed, and the holding ring itself should be rotated directly.

Vertical and Horizontal Mounting

The 9401 Series Rotation Mounts can be supported by an optical post in a vertical configuration using the 8-32 (M4) tapped hole at the bottom. They also feature an 8-32 (M4) counterbored hole in the middle of the mount's base and can be mounted horizontally.