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尽管无波前传感自适应光学技术可不受闪烁效应等波前畸变条件的限制,能够有效地补偿高能激光的波前畸变以提高光束质量,但是激光器光强起伏和噪声干扰对校正效果却存在严重的影响。分析了光强起伏和噪声干扰对随机并行梯度下降(SPGD)算法光束净化效果的影响,并进行了相关实验研究。理论分析表明,在光强起伏频率大于等于算法扰动频率时,系统性能随着光强起伏增加而降低;在低频光强起伏时,SPGD算法的抗干扰能力较强。为消除光强起伏对校正效果的影响,提出采用桶中功率作为系统性能评价函数的光束净化方案,理论分析和实验结果都表明,该方案能够有效地消除光强起伏和噪声干扰对校正效果的影响,实现接近校正极限的理想校正效果。
Although no wavefront sensing adaptive optics is immune to the wavefront distortion conditions such as flicker, it can effectively compensate the wavefront distortion of high-energy laser to improve the beam quality. However, laser intensity fluctuation and noise interference have some effect on the correction Serious impact. The influence of light intensity fluctuation and noise interference on the beam cleaning effect of SPGD algorithm was analyzed and the relevant experimental research was carried out. The theoretical analysis shows that the system performance decreases with the increase of light intensity when the fluctuation of light intensity is greater than or equal to the disturbance frequency of the algorithm, and the anti-interference ability of SPGD algorithm is strong at low-frequency light-intensity fluctuations. In order to eliminate the influence of the fluctuation of light intensity on the correction effect, a beam purification scheme using the power in the bucket as a function of system performance is proposed. Theoretical analysis and experimental results show that this scheme can effectively eliminate the effect of fluctuation of light intensity and noise on the correction effect Influence, and achieve the ideal correction effect close to the correction limit.