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Radial and angular order switchable orbital angular momentum beam generation system and method

A technology of orbital angular momentum and generation method, which is applied in optics, lasers, optical components, etc., can solve problems such as less research, and achieve the effect of high-speed angular mode switching

Active Publication Date: 2022-03-29
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, researchers have conducted preliminary research on the switching of the angular mode of the orbital angular momentum beam, but less research has been done on the switching of the radial mode of the orbital angular momentum beam. Therefore, a radial and angular mode is proposed. The generation method of orbital angular momentum beam with switchable order is very important

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  • Radial and angular order switchable orbital angular momentum beam generation system and method
  • Radial and angular order switchable orbital angular momentum beam generation system and method
  • Radial and angular order switchable orbital angular momentum beam generation system and method

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Embodiment 1

[0033] refer to figure 1 , providing a radial and angular order switchable orbital angular momentum beam generation system, using a coherent fiber laser array to generate an orbital angular momentum beam, and collecting a small part of the coherent fiber laser array output by the system in the coherent fiber laser array generation system And convert it into an electrical signal for servo closed-loop control, generate the phase control signal of each unit beam in the coherent fiber laser array, realize the compensation of the system phase noise and the phase regulation of the coherent fiber laser array; at the same time, by controlling the coherent fiber laser array The switch of each unit beam in the laser array realizes the radial and angular mode switching of the orbital angular momentum beam generated by the coherent fiber laser array.

[0034] The coherent fiber laser array generation system includes a seed source 1, a pre-amplifier 2, a fiber beam splitter 3, a phase modu...

Embodiment 2

[0055] The orbital angular momentum beam generation system and method with switchable radial and angular orders in this embodiment are the same as those in Embodiment 1, and will not be repeated here. The seed laser in this embodiment is split into 36 unit beams, and the generated coherent fiber laser array is composed of 36 unit beams. For the light intensity distribution, see the attached image 3 Shown, where: laser beam waist radius w 0 =0.089mm, beam diameter d=0.2mm, spacing r between the beam center and the origin of each annular sub-array unit 1 =0.22mm, r 2 =0.44mm, r 3 =0.66m, laser working wavelength λ=1064nm.

[0056] First, switch the angular order to generate orbital angular momentum beams. The intensity-modulated coherent fiber laser array composed of 36 unit beams produces an orbital angular momentum beam with a radial order of 0. In order to realize the switching between the angular order 1 and angular order 3 modes, the first circular Expected phase modu...

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Abstract

The present invention proposes a system and method for generating orbital angular momentum beams with switchable radial and angular orders. A coherent fiber laser array is used to generate orbital angular momentum beams, and a small part of the system output is collected in the coherent fiber laser array generation system. The coherent fiber laser array is converted into an electrical signal for servo closed-loop control, and the phase control signal of each unit beam in the coherent fiber laser array is generated to realize the compensation of the system phase noise and the phase regulation of the coherent fiber laser array; at the same time, through the control The switch of each ring-shaped sub-array unit beam in the coherent fiber laser array realizes the radial and angular mode switching of the orbital angular momentum beam generated by the coherent fiber laser array. The invention can realize the high-speed radial mode switching of the orbital angular momentum beam while compensating the dynamic phase noise.

Description

technical field [0001] The invention relates to the technical field of optical fiber laser coherent combination, in particular to a method for generating a radial angular order switchable orbital angular momentum beam. Background technique [0002] In 1992, Allen et al. found that beams with a helical phase structure carry orbital angular momentum, and the subsequent research on orbital angular momentum beams has attracted extensive attention from researchers at home and abroad. OAM beams are characterized by a ring-shaped light intensity distribution with a helical wavefront, and each photon carries an OAM where l is the order of the orbital angular momentum mode. The unique light intensity distribution, phase structure and dynamic characteristics of orbital angular momentum beams promote the development of biomedicine, quantum optics, nonlinear optics, astronomy and microdynamics, and expand space optical communication, optical micro-manipulation, super-resolution A var...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B27/09H01S3/23H01S3/13H01S3/10
CPCG02B27/0927H01S3/23H01S3/2383H01S3/2308H01S3/1305H01S3/10
Inventor 周朴侯天悦马鹏飞马阎星粟荣涛吴坚李灿刘伟姜曼张雨秋常琦常洪祥王涛张嵩司磊许晓军陈金宝
Owner NAT UNIV OF DEFENSE TECH