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Lett."],"published-print":{"date-parts":[[2026,7,15]]},"abstract":"<jats:p>We demonstrate and characterize a fast vector beam generation device based on an acousto-optic modulator embedded in a Sagnac interferometer. This technique enables switching between two programmable vector beams at a refresh rate of up to 200\u2009kHz, whereas the refresh rate of traditional Sagnac-based systems is limited by spatial light modulators to the order of 100\u2009Hz to 1\u2009kHz. Tests demonstrate that our device achieves complete control over the amplitude, phase, and polarization of the diffracted light, maintaining high fidelity even under high-speed switching conditions. 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