title: Note: Fast, small, accurate 90° rotator for a polarizer.
abstract: A permanent magnet stepper motor is modified to hold a dichroic polarizer inside the motor. Rotation of the polarizer by 90° ± 0.04° is accomplished within 80 ms. This device is used for measurements of the intensity ratio for two orthogonal linear polarized components of a light beam. The two selected polarizations can be rapidly alternated to allow for signal drift compensation, and the two selected polarizations are accurately orthogonal.
authors: Department of Physics and Astronomy, University of Nevada, Las Vegas, Nevada 89154-4002, USA.
authors: David P
authors: DP
authors: Shelton
authors: William M
authors: WM
authors: O'Donnell
authors: James L
authors: JL
authors: Norton