In many experiments such as laser cooling of atoms,optical frequency standard and atomic interferometer,the voltage controlled oscillator (VCO) was usually used to shift laser frequency in the past,but its accuracy and stability could not satisfy the demands of the experiments.In this paper,we have demonstrated a direct digital synthesizer(DDS).It can be used in high-accuracy control system for laser frequency shift.This DDS is based on IC AD9852 and micro control unit(MCU).Its amplified output ...