Research On Wavefront Sensorless Wavefront Distortion Correction System

The propagation of light waves in atmospheric media is affected by atmospheric turbulence.The wavefront of light waves is seriously distorted,which seriously affects the imaging and communication of optical systems using atmospheric media.Adaptive optics uses wavefront corrector to compensate wavefront distortion,which has become the best way to solve the atmospheric turbulence problem.Conventional adaptive optical systems use wavefront detectors to detect wavefront errors and correct them.The technology is mature and widely used in large astronomical telescopes.With the development of adaptive optics technology,the application fields begin to expand to optical communications,medical and other civilian fields.The wavefront-free detection adaptive optics system does not use wavefront sensors,which has low cost and small volume,and has broad application prospects.Based on adaptive optics,this paper studies the wavefront distortion correction technology without wavefront sensing.Firstly,the effects of turbulence on the propagation of light waves are analyzed,and the structure and key technologies of the wavefront-sensorless adaptive optics system are discussed.The wavefront distortion correction is numerically simulated using genetic algorithm and random parallel gradient descent algorithm respectively.The feasibility of the algorithm for wavefront distortion correction is verified.Secondly,this paper designs and builds an adaptive optics system without wavefront sensing.A 40-element deformable mirror is used as a wavefront corrector.The data acquisition of the photoelectric detector and the automatic control of the deformable mirror are completed by computer.Finally,the wavefront distortion correction experiment is carried out on the built adaptive optical system without wavefront sensing.The algorithm completes the system's automatic correction of the wave-front distortion.Through the experimental results,analyze whether the algorithm has the ability to correct the wave-front distortion in practical applications.The signal-to-noise ratio of the distorted wavefront after system correction is 1.95 times of that before correction.The experimental results show that the wave-front-free sensing adaptive optical system can effectively correct wave-front distortion.