Acoustic waves within optically transparent materials can create a moving phase grating, diffracting incident light - a phenomenon known as acousto-optic (AO) diffraction. With the advance of nanofabrication technology, integrated guided wave acousto-optical devices now offer improved power consumption and physical footprint. In the discussion, I'll first provide an overview of the Brillouin scattering process and detail our use of piezoelectric materials for the electromechanical excitation of acoustic waves. Then I will introduce our recent work based on the integrated acousto-optics. such as the acousto-optic beamsteering, specifically its application in LiDAR systems, and the integrated acousto-optic modulator, featuring an approach to scaling integrated photonic computing in the synthetic frequency domain.