Acousto-optic tunable filters (AOTF) are used to rapidly and dynamically select a specific wavelength from a broadband or multi-line laser source. The device utilizes the acousto-optic principle in various anisotropic media. It control the wavelength of the transmitted light by controlling the RF signal acting on the AOTF transducer, and can also adjust the amplitude of the RF  signal to achieve the purpose of adjusting the intensity of the transmitted light.