基于泰伯效应的高斯光束尺寸测量

A Scheme Based on Talbot Effect for Measuring Gaussian Beam Spot

光栅用在高斯光束参数测量中的突出优点是方法简单，成本较低。全息光栅由于其制备容易、无周期误差而比一般光栅具有更多的优点。在用光栅进行光斑测量的实验中，观察到由全息光栅引起的泰伯（Talbot）效应携带了有关光斑参数的有用信息。本文提出了一种基于泰伯效应的测量方法，只需测定条纹间隔就能确定高斯光束尺寸，因此降低了对光源或光栅定位精度、电路和光源稳定性的要求。文中就聚焦高斯光束照明全息光栅时光场分布，及其用于高斯光束参数测量的可能性作了分析，理论分析、计算机模拟和实验结果取得了较好的一致。

We observed that Talbot pattern in Gaussian beam passing through aholographic grating may carry information of the beam pot size. A scheme for measuring Gaussian beam diameter based on Talbot effect is presented in this paper. By knowing the space of frings of Talbot pattern, the beam spot size projecting on the holographic grating can be obtained. This characteristic reduces the requirements to location of grating or light source and the stability of electrical circuits and light source. In this paper we describe the phenomena as a convergent Gaussian beam passing through holographic grating, and analyze the possbility of the application of Talbot effect to measuring beam diameter.Theoretical analysis, computer simulation and experiments results agree well with each other.