Digital control method for laser power stabilization

Abstract

Embodiment of this application relate to a digital control method for laser power stabilization. In the embodiments of this application, based on conservation of optical power, that is, the sum of inner-loop optical power and outer-loop optical power is input optical power, a digital proportion integration differentiation (PID) control method combining optical loops and temperature compensation is adopted, which can optimize and adjust a PID control algorithm parameter in a large range in time, make up for the defect that an acousto-optic modulator (AOM) is sensitive to temperature, and meet stability requirements for high anti-interference ability, high precision and high stability of laser power. In addition, in the method, the target light intensity is set by means of a digital constant, thereby getting rid of the dependence on a high-performance voltage reference, reducing costs, and reducing sensitivity of a controller to an environmental parameter, thereby further enhancing a control ability.