Büttner Lars, Thümmler Martin, Czarske Jürgen
Opt Express. 2020 Mar 16;28(6):8064-8075. doi: 10.1364/OE.386047.
Lensless fiber microendoscopes enable optical diagnostics and therapy with minimal invasiveness. Because of their small diameters, multimode fibers are ideal candidates, but mode scrambling hinders the transmission of structured light fields. We present the generation of a localized fringe system at variable distances from the distal fiber end by exploiting digital optical phase conjugation. The replayed fringe system was used for quantitative metrology. Velocity measurements of a microchannel flow in the immediate proximity of the fiber end without the use of any imaging lenses are shown. Lensless multimode fiber systems are of interest especially for biomedical imaging and stimulation as well as technical inspection and flow measurements.
无透镜光纤微型内窥镜能够以最小的侵入性实现光学诊断和治疗。由于其直径小，多模光纤是理想的选择，但模式扰乱会阻碍结构化光场的传输。我们通过利用数字光学相位共轭，在距光纤远端可变距离处生成了一个局部条纹系统。回放的条纹系统用于定量计量。展示了在不使用任何成像透镜的情况下，对光纤末端紧邻处微通道流的速度测量。无透镜多模光纤系统尤其适用于生物医学成像与刺激以及技术检测和流量测量。
