光学学报, 2010, 30 (5): 1396, 网络出版: 2010-05-11   

SPGD算法光束净化中光强起伏对校正效果的影响研究

Investigation on Influence of Laser Intensity Fluctuation on Beam Cleanup System Based on Stochastic Parallel Gradient Descent Algorithm
作者单位
国防科技大学 光电科学与工程学院,湖南 长沙 410073
摘要
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。
Abstract
Although adaptive optics technique without a wave-front sensor can get rid of the restriction of the terms of wave-front aberrations and is an effective way to compensate the wave-front distortion of the high power laser beam to improve the beam quality,the laser intensity fluctuation and the circuit noise will make the performance of the system deteriorate. The influence of intensity fluctuation and the circuit noise on the results of the beam cleanup system based on stochastic parallel gradient descent (SPGD) algorithm is analyzed,corresponding experiments is done. Result shows that when the frequency of the laser intensity fluctuation is faster than or equal to the disturbance rate,the performance of the system decreases quickly with an increasing amplitude of intensity fluctuation. In the case of low intensity fluctuation rate,the capability of anti-jamming of the SPGD algorithm is excellent. To avoid the influence of the intensity fluctuation and the circuit noise on beam cleanup system,beam cleanup technology based on normalized performance evaluation function:power-in-bucket (PIB) is proposed. Both theoretical and experimental results show that this technology is an effective way to avoid the influence of intensity fluctuation and the circuit noise on beam cleanup system,ideal results approaching the correction limit of the system can be obtained.

王小林, 王三宏, 周朴, 马浩统, 马阎星, 许晓军, 刘泽金, 赵伊君. SPGD算法光束净化中光强起伏对校正效果的影响研究[J]. 光学学报, 2010, 30(5): 1396. Wang Xiaolin, Wang Sanhong, Zhou Pu, Ma Haotong, Ma Yanxing, Xu Xiaojun, Liu Zejin, Zhao Yijun. Investigation on Influence of Laser Intensity Fluctuation on Beam Cleanup System Based on Stochastic Parallel Gradient Descent Algorithm[J]. Acta Optica Sinica, 2010, 30(5): 1396.

本文已被 1 篇论文引用
被引统计数据来源于中国光学期刊网
引用该论文: TXT   |   EndNote

相关论文

加载中...

关于本站 Cookie 的使用提示

中国光学期刊网使用基于 cookie 的技术来更好地为您提供各项服务,点击此处了解我们的隐私策略。 如您需继续使用本网站,请您授权我们使用本地 cookie 来保存部分信息。
全站搜索
您最值得信赖的光电行业旗舰网络服务平台!