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散斑抑制是阻碍以激光为光源的显示技术发展的技术瓶颈。通过实验分析了散射片的发散角、级联散射片的数量和它们之间的间距对散射光束相关面积宽度的影响。在级联散射片和光通管构成的散射体的基础上,利用多重散射理论解释了级联散射片减弱激光相干性的现象。基于积分散斑的统计学理论,推导了CCD积分时间T内捕获的散斑图样的强度自协方差函数与散斑对比度之间的关系,并明确了级联散射片对运动散射片位移的影响,从而达到抑制散斑的目的。实验结果表明,将散射体与运动散射片相结合不仅提高了整体光能利用率,在检测器积分时间1/30s内还能将散斑对比度从0.753降低到0.069。
Speckle suppression is a technical bottleneck that hinders the development of display technology using laser as a light source. The effects of the divergence angle of the diffuser, the number of cascaded diffusers and the distance between them on the area of the scattered beam are analyzed experimentally. Based on the scatterers composed of cascaded diffusers and light pipes, the theory of multiple scattering is used to explain the phenomenon that the cascaded diffuser attenuates the laser coherence. Based on the statistical theory of integral speckle, the relationship between the intensity autocovariance function and the speckle contrast of the speckle pattern captured during the CCD integration time T is derived, and the influence of the cascaded diffuser on the displacement of the moving diffuser , So as to achieve the purpose of inhibiting speckle. The experimental results show that the combination of scatterer and motion diffuser not only improves the overall utilization of light energy, but also reduces speckle contrast from 0.753 to 0.069 within 1 / 30s of detector integration time.