Propagation characteristics of orbital angular momentum modes at 810 nm in step-index few-mode fibers

Wang, Zhouxiang; Xie, Yuchen; Huang, Shuang-Yin; Zhou, Han; Liu, Rui; Liu, Zhifeng; Wang, Min; Qi, Wen-Rong; Tian, Qian-Qian; Kong, Ling‐Jun; Tu, Chenghou; Li, Yongnan; Wang, Hui-Tian

doi:10.3788/col201917.120601

中国光学快报

2019

DOI: 10.3788/col201917.120601

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Propagation characteristics of orbital angular momentum modes at 810 nm in step-index few-mode fibers

Zhouxiang Wang

Yuchen Xie

Shuang-Yin Huang

et al.

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“…We now explore the identification of the symmetry of object by measuring the OAM spectrum of the output beam through an FMF. As we demonstrated, [13] during the transmission of the OAM mode in an FMF, its handedness is hard to be maintained completely, but its absolute value (i.e., topology of OAM mode) can be protected. Such a transmission characteristic of FMFs provides a possibility to recognize the symmetry of object when the beam carrying the symmetry information of object passes through an FMF.…”

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“…[11,12] In our previous work, we studied the propagation property of OAM in commercial step-index FMFs. [13] In this work, we carry out digital spiral imaging experiment to realize the symmetry recognition of the object after the probe beam passes through a commercial step-index FMF. The FMF we used is an OFS-1550TMF fiber, which is a two-mode fiber at 1550 nm, but more modes can be supported in the 810 nm we used here.…”

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Identifying the Symmetry of an Object Based on Orbital Angular Momentum through a Few-Mode Fiber^*

Wang

Xie

Zhou

et al. 2019

Chinese Phys. Lett.

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In recent years, orbital angular momentum (OAM), as a new usable degree of freedom of photons, has been widely applied in both classical optics and quantum optics. For example, digital spiral imaging uses the OAM spectrum of the output beam from the object to restore the symmetry information of the object. However, the related experiments have been carried out in free space so far. Due to the poor anti-noise performance, limited transmission distance and other reasons, the practicability is seriously restricted. Here, we have carried out a digital spiral imaging experiment through a few-mode fiber, to achieve the identification of the symmetry of object by measuring the OAM spectrum of the output beam. In experiment, we have demonstrated the identification of the symmetry of amplitude-only and phase-only objects with the two-, three- and four-fold rotational symmetries. We also give the understanding of the physics. We believe that our work has greatly improved the practical application of digital spiral imaging in remote sensing.

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confidence: 92%

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confidence: 99%

Identifying the Symmetry of an Object Based on Orbital Angular Momentum through a Few-Mode Fiber^*

Wang

Xie

Zhou

et al. 2019

Chinese Phys. Lett.

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Properties of the generation and propagation of spatiotemporal optical vortices

et al. 2021

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Spatiotemporal optical vortex (STOV) light is a new type of vortex light with transverse orbital angular momentum (OAM) which is different from conventional spatial vortex light. Understanding the properties of STOV are meaningful before STOV are applied. We present a theoretical study on the generation and propagation of spatiotemporal vortices step by step based on diffraction theory. The properties of the output pulses with different topological charges generated using 4 f pulse shaper in both the near-field and the far-field are analyzed. Using spiral phase mask, the intensity profiles of the output pulses immediately after the 4 f pulse shaper are of multi-lobe structures. With energies circulating around the phase singularity in the space-time plane, energy coupling occurs between the spatial and temporal domains in the wave packets during propagation, then the intensity profiles evolve into multi-hole shapes, and the holes tend to be merged for higher order STOV. The conservation of OAM in the space-time domain is shown clearly. The profiles of the output pulses in the near-field form donut rectangle shapes using π-step mask, and in the far-field, they split into a multi-lobe structure. The rules of the generation and evolution of STOV are revealed. The results demonstrate the physical properties of the STOV and the generation and propagation processes directly and clearly. It provides a guidance on the application of STOV.

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Propagation characteristics of orbital angular momentum modes at 810 nm in step-index few-mode fibers

Cited by 2 publications

References 0 publications

Identifying the Symmetry of an Object Based on Orbital Angular Momentum through a Few-Mode Fiber^*

Identifying the Symmetry of an Object Based on Orbital Angular Momentum through a Few-Mode Fiber^*

Properties of the generation and propagation of spatiotemporal optical vortices

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Propagation characteristics of orbital angular momentum modes at 810 nm in step-index few-mode fibers

Cited by 2 publications

References 0 publications

Identifying the Symmetry of an Object Based on Orbital Angular Momentum through a Few-Mode Fiber*

Identifying the Symmetry of an Object Based on Orbital Angular Momentum through a Few-Mode Fiber*

Properties of the generation and propagation of spatiotemporal optical vortices

Contact Info

Product

Resources

About

Identifying the Symmetry of an Object Based on Orbital Angular Momentum through a Few-Mode Fiber^*

Identifying the Symmetry of an Object Based on Orbital Angular Momentum through a Few-Mode Fiber^*