Mündliche Prüfung »   How a Space Acousto-optic Modulator Enables Precision Laser Beam Steering in Vacuum

At the heart of a Space Acousto-Optic Modulator (AOM) is a piezoelectric transducer bonded to a specialized crystal, such as Tellurium Dioxide or Lithium Niobate. When an RF signal is applied, it generates acoustic waves—essentially high-frequency sound—that travel through the crystal, creating periodic changes in the refractive index. This acts as a "virtual" diffraction grating. In the vacuum of space, where there is no air to interfere with the light path, the laser undergoes Bragg diffraction as it passes through the crystal.
https://www.cq-smart.com/space-acousto-optic-modulator-aom-aofs