Andersen Jasmine M, Alperin Samuel N, Voitiv Andrew A, Holtzmann William G, Gopinath Juliet T, Siemens Mark E
Appl Opt. 2019 Jan 10;58(2):404-409. doi: 10.1364/AO.58.000404.
We demonstrate collinear phase-shifting holography for measuring complex optical modes of twisted light beams with orbital angular momentum (OAM) generated by passing a laser through a spatial light modulator (SLM). This technique measures the mode along the direction of propagation from the SLM and requires no additional optics, so it can be used to aid alignment of the SLM, to efficiently check for the effects of beam wander, and to fully characterize generated beams before use in other experiments. Optimized error analysis and careful SLM alignment allow us to generate and measure OAM with purity as high as 99.9%.
我们展示了共线相移全息术，用于测量通过让激光穿过空间光调制器（SLM）产生的具有轨道角动量（OAM）的扭曲光束的复光学模式。该技术沿从SLM传播的方向测量模式，并且不需要额外的光学元件，因此可用于辅助SLM的对准，有效地检查光束漂移的影响，并在用于其他实验之前全面表征所产生的光束。优化的误差分析和仔细的SLM对准使我们能够生成和测量纯度高达99.9%的OAM。
