Phase measurement of vortex beam after underwater transmission based on heterodyne interference

Luo Xin; Chen Qiangshen; Yuan Chenyuan; Zhu Qihua; Zhang Hang; Feng Guoying

doi:10.11884/HPLPB202436.240027

Volume 36 Issue 6

May 2024

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Article Navigation > High Power Laser and Particle Beams > 2024 > 36(6): 061003

Luo Xin, Chen Qiangshen, Yuan Chenyuan, et al. Phase measurement of vortex beam after underwater transmission based on heterodyne interference[J]. High Power Laser and Particle Beams, 2024, 36: 061003. doi: 10.11884/HPLPB202436.240027

Citation:

Luo Xin, Chen Qiangshen, Yuan Chenyuan, et al. Phase measurement of vortex beam after underwater transmission based on heterodyne interference[J]. High Power Laser and Particle Beams, 2024, 36: 061003. doi: 10.11884/HPLPB202436.240027

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Phase measurement of vortex beam after underwater transmission based on heterodyne interference

doi: 10.11884/HPLPB202436.240027

1.
Institute of Laser and Micro/Nano Engineering, College of Electronics and Information Engineering, Sichuan University, Chengdu 610065, China
2.
Laser Fusion Research Center, CAEP, Mianyang 621900, China
3.
Chengdu University of Technology, Chengdu 610059, China

Received Date: 2024-01-20
Accepted Date: 2024-05-08
Rev Recd Date: 2024-05-08

Available Online: 2024-05-11

Publish Date: 2024-05-11

Abstract

Abstract

When a vortex beam propagates in a turbulent medium, the phase will be distorted by the influence of turbulent motion. In this paper, a point pixel phase extraction method based on heterodyne interference is proposed. By collecting the relative phase of each point's interference fringes in a period, the phase distribution of a vortex beam is reconstructed after its turbulent transmission under water. The random phase screen is generated by the power spectrum inversion method, and the transmission simulation of the vortex beams under different turbulence is completed. The result shows that the distortion increases with the increase of turbulence intensity. An experimental device was built to realize the phase measurement of vortex beams in underwater environments. The experimental results show that when a vortex beam is transmitted in turbulent water, its complex amplitude distribution undergoes a relatively complicated transmission process, and its intensity distribution and phase are distorted. The method proposed in this paper can accurately measure the complex phase distribution of a vortex beam and effectively identify its topological charges.
- vortex beam,
- underwater turbulence,
- heterodyne interference,
- random phase screen,
- phase measurement

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References(26)

References

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