摘要
对于光斑主轴在传输过程中不停变化的扭曲光束,采用光斑主轴方向上的光束传输比对光束质量等特性进行表征和描述并不全面。针对扭曲高斯光束,在光束传输矩阵的理论计算的基础上,研究了通过双柱透镜产生扭曲光束的方法;推导得到了光束在交叉方向上光束传输比的表达式,并定义了一个新的物理量-光束的扭曲系数;分别采用光束传输矩阵和数值模拟,得到了不同柱透镜之间夹角和间距下的扭曲系数,通过光束传输比和扭曲系数共同对扭曲光束进行表征。结果表明,相比于单纯的光束传输比,两者的组合能够更好地对扭曲光束进行表征。通过实验对理论和仿真结果进行了验证,理论结果和实验结果相符。
The characterization of the twist beam can not be accomplished by using only the beam propagation ratios because the transverse cross section keeps changing during propagation. The generation and characterization of the twist Gaussian beam by two cylinder lenses are studied theoretically and experimentally. The twist coefficient is introduced to characterize the level of twist. The beam propagation ratios for the twist Gaussian beam at an azimuth angle a are theoretically derived. The twist coeffi- cients of the twist beams generated by two cylinder lenses with different angle and spacing are obtained by using the beam-trans- fer-matrix and the numerical simulation. The results show that the properties of the twist beam can be characterized better by the combination of the beam propagation ratios and the twist coefficient. The theoretical work is in good agreement with the experimental results.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2017年第7期1-8,共8页
High Power Laser and Particle Beams
基金
国家自然科学基金项目(11574221)
国家高技术发展计划项目
关键词
扭曲系数
扭曲光束
双柱透镜
高斯光束
光束质量测量
twist coefficient
twist beam
two cylinder lenses
Gaussian beam
beam quality measurement
