针对现有多模光纤数字扫描成像方法, 形成扫描聚焦光斑计算量大、速度慢的问题, 提出了一种基于自适应并行坐标(Adaptive Parallel Coordinate, APC)算法的单根多模光纤数字扫描成像方法, 通过控制多模光纤输入端的光场, 在单根多模光纤出射端实现光斑的聚焦和扫描。建立了单根多模光纤数字扫描成像数学模型; 采用自适应并行坐标算法对空间光调制器(Spatial Light Modulator, SLM)加载相位进行优化, 有效缩短了扫描聚焦光斑的形成时间, 提高了成像速度。实际生成30×30个聚焦光斑, 对50 μm×50 μm范围的分辨率板进行扫描成像。实验证明, 该方法实现了单根多模光纤对距离光纤端面60 μm处平面内的目标成像, 分辨率达到2.46 μm。

For the problem of large computation and slow speed to generate the focused spots in the multimode fiber digital scanning imaging method, the digital scanning imaging method with a single multi-mode fiber (MMF) was proposed based on adaptive parallel coordinate(APC) algorithm. By controlling the input field of the MMF, the focused spots were formed. The theoretical imaging model of single MMF digital scanning was established. APC algorithm was adopted to optimize the phase on the spatial light modulator(SLM), which can effectively reduce the time to form focused spots and improve the imaging speed. 30×30 focused spots were formed to sample the resolution target in 50 μm×50 μm region. The experiment demonstrates that the object on the sample plane 60 μm far from the MMF output end can be reconstructed. The resolution is 2.46 μm.