偏振激光散斑的偏振态测量研究

Measurement ofPolarization State of Polarized Laser Speckle

偏振激光散斑偏振态的问题已进行过深入的研究,但在大多数研究中,没有考虑具有影响透射光的偏振和传播方向的各向异性折射率材料。为了对各向异性介质产生的偏振激光散斑展开研究,采用马赫-曾德尔干涉仪的方法,搭建偏振干涉实验光路,用MATLAB对双折射散射板产生的偏振激光散斑进行处理并分析。实验结果表明,各向异性折射率材料会影响透射光的偏振和传播方向,与普通磨砂玻璃相比,双折射散射板产生的偏振激光散斑图包含了更多的偏振信息,即椭圆偏振态、线偏振态和圆偏振态,而不是单一的一种偏振态。这对具有随机偏振态的表面散射现象的研究奠定了基础。

The polarization state of polarized laser speckle has been studied in depth,but in most studies,anisotropic refractive index materials that affect polarization and propagation direction of transmitted light are not considered.In order to study the polarized laser speckle generated by anisotropic media,the optical path of polarization interference experiment is established by means of Mach-Zehnder interferometer.And the polarized laser speckle generated by the birefringent scattering plate is processed and analyzed by MATLAB.Experimental results show that anisotropic refractive index materials affect the polarization and propagation direction of transmitted light.Compared with common frosted-glass,the polarized laser speckle produced by birefringent scattering plate contains more polarization information i.e.elliptical polarization state,linear polarization state and circular polarization state,rather than a single polarization state.This lays a foundation for the study of surface scattering with random polarization states.