  We present a technique for generating light in an arbitrary polarization
state. The technique is based on interference of two orthogonally polarized
light beams, whose amplitudes and phases are controlled with a Mach-Zehnder
inteferometer with acousto-optic modulators (AOMs) placed in each arm. We
demonstrate that via control over amplitudes, phases, and frequencies of
acoustic waves driving the AOMs, any polarization state can be synthesized. In
particular, we demonstrate generation of linearly polarized light, whose
polarization plane continuously rotates at a rate from 1~kHz to 1~MHz. Such
light finds applications in science (e.g., investigations of Bloch-Siegert
effect) and technology (optically-pumped magnetometers).
