Making use of acousto-optic Bragg diffraction effect, Acousto-optic modulators (AOMs) are versatile active optical devices that can e?iciently change both the frequency and the propagating direction of an optical field in real time, AOMs are widely used in optics and laser technology. In the experiments related with quantum optics and quantum information technology, AOMs have been used in various applications, including the controlling of probe light in quantum memory, observation the beating signal from single photons, generation of a phase locking reference in squeezed vacuum state generation experiment and in photon subtraction based Non-Gaussian state generation experiment.