Abstract:With the fast development of laser technology, the applications of TeO2 crystals and their devices are continuously expanded, such as signal processing, time-frequency conversion, spectrum analysis and other fields. TeO2 crystal has excellent acousto-optic properties and it is widely used in the production of various acousto-optic devices. In this paper, the basic concepts and principles of acousto-optic diffraction are firstly summarized, including Raman-Nath diffraction and Bragg diffraction. Secondly, the crystal structure, crystal preparation process, defect analysis and performance testing of TeO2 crystal are summarized. Then the structure of acousto-optic device, the preparation process of core component, and the typical commercial acousto-optic device products are introduced. In the end, the application prospect and prospect of TeO2 crystal and acousto-optic device are prospected.