论文标题
基于斑点的单个激光束的极化状态的测定
Speckle-based determination of the polarisation state of single and multiple laser beams
论文作者
论文摘要
激光斑点是通过通过无序介质的光的多重干扰产生的。在这里，我们研究了斑点模式保留有关事件场极化状态的信息的前提。我们在分析上验证了光线的Stokes向量与所得斑点模式之间存在线性关系。结果，可以使用传输矩阵方法从斑点图案中测量梁的极化状态。我们对传输矩阵方法的准确性进行定量分析，以测量随机时间变化的极化状态。在实验中，我们发现，使用150 $ \ times $ 150像素和17个训练状态的斑点图像，可以以0.05的不确定性检索来自二极管激光的光参数。我们通过分析和实验表明，该方法可以扩展到一个以上激光场的情况，这表明从单个斑点模式同时测量了两个激光束的Stokes参数，并实现了相同的不确定性0.05。
Laser speckle is generated by the multiple interference of light through a disordered medium. Here we study the premise that the speckle pattern retains information about the polarisation state of the incident field. We analytically verify that a linear relation exists between the Stokes vector of the light and the resulting speckle pattern. As a result, the polarisation state of a beam can be measured from the speckle pattern using a transmission matrix approach. We perform a quantitative analysis of the accuracy of the transmission matrix method to measure randomly time-varying polarisation states. In experiment, we find that the Stokes parameters of light from a diode laser can be retrieved with an uncertainty of 0.05 using speckle images of 150$\times$150 pixels and 17 training states. We show both analytically and in experiment that this approach may be extended to the case of more than one laser field, demonstrating the measurement of the Stokes parameters of two laser beams simultaneously from a single speckle pattern and achieving the same uncertainty of 0.05.
