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Wavefront engineering for controlled structuring of far-field intensity and phase patterns from multimodal optical fibers
APL Photonics ( IF 5.6 ) Pub Date : 2021-05-04 , DOI: 10.1063/5.0044666
Liam Collard 1 , Filippo Pisano 1 , Marco Pisanello 1 , Antonio Balena 1, 2 , Massimo De Vittorio 1, 2 , Ferruccio Pisanello 1
Affiliation  

Adaptive optics methods have long been used to perform complex light shaping at the output of a multimode fiber (MMF), with the specific aim of controlling the emitted beam in the near field and enabling the realization of a new generation of endoscopes based on a wide variety of spectroscopic techniques. Gaining control of other emission properties, including the far-field pattern and the phase of the generated beam, would open up the possibility for multimode fibers to act as miniaturized multi-beam steering components and to implement phase-encoded imaging and sensing. In this study, we employ phase modulation using a spatial light modulator at the input of a multimode fiber to generate multiple, low divergence rays with controlled angles and phase at the fiber output. Direct measurement of the output angle and the divergence and phase of the generated beams show how wavefront engineering can be employed to perform complex far-field structuring of the emission of a MMF.

中文翻译:

用于控制多模光纤远场强度和相位模式结构的波前工程

长期以来,自适应光学方法一直被用于在多模光纤 (MMF) 的输出端执行复杂的光整形,其特定目的是控制近场中的发射光束,并实现基于宽范围的新一代内窥镜。各种光谱技术。获得对其他发射特性的控制,包括远场模式和生成光束的相位,将为多模光纤作为小型化多光束控制组件和实现相位编码成像和传感提供可能性。在这项研究中,我们在多模光纤的输入端使用空间光调制器采用相位调制,以在光纤输出端生成多个角度和相位受控的低发散光线。
更新日期:2021-05-28
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