搭建测试系统，对宽面源单管半导体激光器(LD)和其组成的二维阵列光源的远场散斑特性进行了测量。使用方形光阑对激光二极管发出的照明光斑进行选择，测试不同位置的光斑的散斑对比度，实验结果表明随着光阑的移动，不同位置处光斑的散斑对比度没有明显的变化趋势，光斑的散斑对比度与光斑的选择区域无关。实验中使用4颗LD组成二维阵列光源引入非相干光源和角度多样性，调节LD与屏幕之间的距离改变相邻LD入射至屏幕的光的夹角，固定CCD物镜相对屏幕的张角，实验结果表明只有当入射光夹角大于物镜相对屏幕张角时，测试的散斑对比度会降低一个1/M因子。

Far field speckle characteristics of a broad area laser diode (LD) and a two-dimension (2D) laser diode array (LDA) made of single diode are measured respectively. A rectangular aperture close to diffuser is used to select different parts of laser light field as illumination spot. The speckle contrast measured for different illumination spots has no obvious trend (turn up or down) along the movement of rectangular aperture. It means that there′s no relationship between contrast and the laser light field selected. 2D LDA made of four LDs produces incoherent light and angular diversity. Adjusting the distance between array and diffuser to change the angular of adjacent incidence into diffuser. The distance from lens to diffuser is fixed. The experimental results shows that, only when the angular is larger than that of imaging lens seen from the diffuser, the contrast of the speckle is reduced by a factor of 1/M.