基于塑料光纤的激光散斑特性研究

摘要

In order to solve the speckle problem in laser imaging systems , characteristics of laser speckle in imaging systems were studied with the fiber vibrated by a speaker driven by ULN 2003 chip.In this experiment, using 532nm wavelength laser as light source of system and using linear CCD image sensor acquisition system to acquire laser speckle images , laser speckle contrast of plastic fiber was analyzed at different vibration frequencies .The results show that when fiber vibration amplitude is stable and vibration frequency increases from 0Hz to 20Hz, image speckle contrast decreases .When vibration frequency is more than 16Hz, image speckle contrast tends to be stable and can get good effect of speckle elimination .The study can be used for laser display , laser imaging and other fields .%为了解决激光成像系统中的散斑问题,利用ULN2003芯片驱动喇叭振动光纤对激光成像系统中的散斑特性进行了研究. 采用波长为532 nm的激光作为系统光源,通过线阵CCD图像传感采集系统对激光散斑图像进行采集,对塑料光纤在不同振动频率下的激光散斑对比度进行了分析. 结果表明,在光纤振动幅度不变、振动频率在0Hz~20Hz内逐渐增加时,图像散斑对比度逐渐减小;当振动频率大于16Hz时,图像的散斑对比度趋于稳定,达到良好的散斑抑制效果,可用于激光显示及激光成像等领域.