摘要
本文通过理论模拟和实验验证研究了角向偏振无衍射光经过圆形障碍物后具有自重建和偏振状态不随传输距离改变而改变的特性。以及角向偏振无衍射光束经过散射介质后,随着散射介质目数的增加,产生的散斑的尺寸逐渐减小.实验首先采用高斯光束经过偏振转换仪,然后再入射到轴棱锥上产生角向偏振无衍射光束。再使角向偏振无衍射光束经过散射介质形成散斑场,研究表明,随着散射介质目数的增多,形成的散斑颗粒大小也逐渐减小。随着角向偏振无衍射光束的锥角逐渐减小,形成的散斑场颗粒大小逐渐增大。理论仿真和实验结果一致。
We do research on the propagation characteristics of the azimuthally polarized non-diffracting beams （ APB）, and their propagation through the scattering medium. Based on the theoretical simulation, we study the prop- agation characteristics of APB, and the influence of the angle of the axicon for producing non-diffraction beam on the speckle. Moreover, we make study of the influence of polarization state of the light beams on the speckle. We experi- mentally set a Gaussian beam passing through a polarization converser to achieve the azimuthally polarized light beam, and the azimuthally polarized light beam is incident on a axicon to get APB. Then we discuss the speckle produced by passing APB through the scattering medium. It is found from the theoretical simulation that the speckle sizes will de- crease as the increasing of the size of the scattering medium, and size of the speckle will increase with the decreasing of the angle of the axicon for producing the non-diffraction beams.
出处
《激光杂志》
北大核心
2017年第6期16-20,共5页
Laser Journal
基金
国家自然科学基金(61178015)
福建省中青年教师教育科研项目(JAT160634)
