Research On Wavefront Sensorless Adaptive Optics Based On Mode Algorithm

In the field of wireless laser communication, the adaptive optical system can correct the transmission wavefront phase distortion caused by atmospheric turbulence and optimize the index function of the transmitted laser, thus restraining the random variation caused by the atmospheric turbulence to the transmitted laser.According to the different correction methods, adaptive optics is divided into wavefront adaptive optics and wavefront sensorless adaptive optics. In this paper, wavefront sensorless adaptive optics is studied.wavefront sensorless adaptive optics is used to optimize the index function such as laser power to improve the quality of laser transmission in atmospheric communication. From the existing literature, wavefront sensorless adaptive optics algorithms are mainly two types: one is a model-free algorithm, including genetic algorithm, simulated annealing algorithm, SPGD algorithm and so on, such algo rithms through multiple iterations on the index function To optimize the correction to achieve the effect, however, If the number of deformed mirror channels in the adaptive optics system is very large, the correction speed of the algorithm will be very slow. Another kind of algorithm is the model algorithm studied in this paper, compared with the model-free algorithm, the number of iterations of the pattern method is small, the convergence speed is fast, and the real-time perfor mance is better. The work done in this paper is as follows.First of all, this paper introduces the development of adaptive optics and dynamic at home and abroad, and some wavefront sensorless adaptive optics techniques are introduced and the theoretical analysis of Lukosz mode algorithm is completed.Next, we designed and developed with the FPGA chip as the core processor of set of hardware module, the hardware module can complete laser capture, spot gray value sampling, the system index function calculation and Lukosz mode algorithm implementation and other functions.Finally, the software flow design, frame construction, code writing, simulation and hardware module debugging of Lukosz mode algorithm are completed. the wavefront sensorless adaptive optical system experiment platform based on Lukosz mode algorithm is built and verified by experimental platform Theoretical analysis of the conclusions. The experimental results show that the system can realize the distortion phase correction function and meet the design requirements.