摘要
推导了偏振相干合成后任意方向检偏的光强受束间相位差调制的解析表达式,并通过实验验证了表达式的正确性。开展了基于偏振鉴相的相干合成实验研究,用梯度下降算法锁定了两束激光的相位,获得了稳定的输出功率,验证了基于偏振鉴相的相干合成技术可行性;分析了基于偏振鉴相的相干合成技术的优点和对激光器的要求;提出了一种基于偏振鉴相的可定标放大全口径相干合成方法,采用多探测器和多级并行相位调制的方法,解决了随机并行梯度下降(SPGD)算法闭环带宽随合成光束数增加而快速退化的问题。
The analytic expression of the intensity of any polarizing direction versus the phase difference in polarization coherent beam combining is deduced.The validity of the expression is proved by experiment.The coherent beam combining（CBC） experiment based on polarization phase discrimination is designed to verify the feasibility of CBC based on polarization phase discrimination.The phase of two laser beam is locked using gradient descent algorithm and a stable power output is acquired.The advantage of this technology and the requirement of lasers are analyzed.A scalable architecture of full aperture CBC based on polarization phase discrimination which can be proportionally amplified is proposed.The quick degradation of the bandwidth of the stochastic parallel gradient descent algorithm（SPGD） as the increase of the CBS beams is solved by multiple parallel phase detection and modulation.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2013年第B05期5-8,共4页
High Power Laser and Particle Beams
基金
中物院发展基金资助课题(2009A0401024)
关键词
偏振相干合成
相位探测
随机并行梯度下降算法
外差法
polarization coherent beam combining
phase detection
stochastic parallel gradient descent algorithm
heterodyne method
