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We present a simple motorised rotation mount for a half-wave plate that canbe used to rapidly change the polarization of light. We use the device toswitch a high power laser beam between different optical dipole traps in anultracold atom experiment. The device uses a stepper motor with a hollow shaft,which allows a beam to propagate along the axis of the motor shaft, minimisinginertia and mechanical complexity. A simple machined adapter is used to mountthe wave plate. We characterise the performance of the device, focusing on itscapability to switch a beam between the output ports of a polarizingbeamsplitter cube. We demonstrate a switching time of 15.9(3) ms, limited bythe torque of the motor. The mount has a reaction time of 0.52(3) ms, and arotational resolution of 0.45 degrees. The rotation is highly reproducible,with the stepper motor not missing a step in 2000 repeated tests over 11 hours.

A motorized rotation mount for fast and reproducible optical polarization control