Čižmár Tomáš, Dholakia Kishan
School of Medicine, University of St Andrews, North Haugh, St Andrews, Fife, KY16 9TF, Scotland, UK.
Opt Express. 2011 Sep 26;19(20):18871-84. doi: 10.1364/OE.19.018871.
We present a powerful approach towards full understanding of laser light propagation through multimode optical fibres and control of the light at the fibre output. Transmission of light within a multimode fibre introduces randomization of laser beam amplitude, phase and polarization. We discuss the importance of each of these factors and introduce an experimental geometry allowing full analysis of the light transmission through the multimode fibre and subsequent beam-shaping using a single spatial light modulator. We show that using this approach one can generate an arbitrary output optical field within the accessible field of view and range of spatial frequencies given by fibre core diameter and numerical aperture, respectively, that contains over 80% of the total available power. We also show that this technology has applications in biophotonics. As an example, we demonstrate the manipulation of colloidal microparticles.
我们提出了一种强有力的方法，用于全面理解激光在多模光纤中的传播以及控制光纤输出端的光。多模光纤内的光传输会使激光束的幅度、相位和偏振产生随机化。我们讨论了这些因素各自的重要性，并介绍了一种实验装置，该装置能够对通过多模光纤的光传输进行全面分析，并利用单个空间光调制器进行后续的光束整形。我们表明，使用这种方法，可以在分别由光纤芯径和数值孔径给出的可及视场和空间频率范围内生成包含超过80%可用总功率的任意输出光场。我们还表明，这项技术在生物光子学中有应用。例如，我们展示了对胶体微粒子的操控。
