Geng, Yi; Chen, Hui; Zhang, Zaikun; Zhuang, Bin; Guo, Haitao; He, Zhengquan; Kong, Depeng

A binary phase-only modulation technique was proposed to focus and scan light through a multimode fiber (MMF) based on spatial light modulator (SLM). For the same number of modulation modes, the number of iterations using this method is only 1/256 of that using phase-only iterative optimization or 1/3 of that using phase-only computation optimization, and the modulation time is at least one to two orders of magnitude shorter than previous wavefront shaping systems. Focusing and scanning light through an MMF with a 105 mu m core diameter and 5 m length was achieved experimentally. This method can be extended to focus and scan light at multiple planes along the axial direction by modifying the input wavefront accordingly.

The result was published on APPLIED PHYSICS B-LASERS AND OPTICS.  DOI: 10.1007/s00340-021-07573-1