摘要
针对激光系统对光束匀滑的需求,设计了高斯型连续相位板,并对其远场特性进行了研究。分别计算了相干长度为39,30,10和3 mm的高斯相位板远场光斑分布,结果显示相位板自身相关长度是决定远场能量分布的重要因素,当相干长度大于10 mm时,由于不满足各态历经条件,远场光斑分布能量分散。当相干长度小于10 mm后,由于满足各态历经条件,远场光斑能量将接近理想的高斯分布特性。通过数值计算模拟了相干长度为3 mm的连续相位板对畸变光束进行匀滑处理的过程,演示了束匀滑处理结果。通过比较匀滑前后远场光斑的能量分布,显示了畸变光束通过连续相位板后远场光斑能量分布变化情况,通过相位板后,光斑形状明显接近理想高斯分布情况。
According to the requirement of beam smoothing in laser systems, the continuous phase plate with Gaussian distribution is designed. The far-field distributions of such phase plate with correlation lengths of 39 mm, 30 mm, 10 mm and 3 mm arecalculated. The numerical results show that while the correlation length is longer than 10 mm, far-field distribution of the phase plate is inordinate for the ergodic condition is not satisfied. While the correlation length is less than 10 mm, far-field distribution of the phase plate is very close to ideal Gaussian distribution. Using the continuous phase plate with the correlation length of 3 mm, the beam smoothing process is simulated. The results show that after propagating through a phase plate the intensity distribution of the laser beam on the focal plane accords with G uassian distribution.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2009年第7期1023-1026,共4页
High Power Laser and Particle Beams
基金
国家高技术发展计划项目
关键词
衍射光学
连续相位板
高斯分布
束匀滑
diffractive optics
continuous phase plate
Gaussian distribution
beam smoothing
