自由空间声光调制器是对激光光束进行强度调制及移频处理的一类产品。其性能特点是调制速度快、衍射效率高、通断消光比高。Free space acoustooptic modulator is a kind of laser beam intensity modulation and frequency shift processing products. Its performance is characterized by fast modulation speed, high diffraction efficiency and high on-off extinction ratio.