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Device and system for measuring orbital angular momentum spectrum of light beam

A technology of orbital angular momentum and incident light beams, which is applied in the field of optoelectronics, can solve the problems of difficult resolution of light spots and increase the complexity of spectrum measurement, and achieve the effect of simplifying the number of devices, simple structure, fast and accurate measurement

Active Publication Date: 2016-04-20
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for adjacent orbital angular momentum states, the two light spots on the receiving screen will be difficult to distinguish because they are relatively close
At the same time, the two phase screens also increase the complexity of spectrum measurement

Method used

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  • Device and system for measuring orbital angular momentum spectrum of light beam
  • Device and system for measuring orbital angular momentum spectrum of light beam
  • Device and system for measuring orbital angular momentum spectrum of light beam

Examples

Experimental program
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Effect test

Embodiment 1

[0049] Embodiment 1: Measurement of the orbital angular momentum spectrum of a vortex beam whose orbital angular momentum components are respectively +4 order and -4 order and the ratio is 1:1.

[0050] Figure 5(a) shows the light field distribution of the vortex beam with orbital angular momentum components of +4 order and -4 order and a ratio of 1:1, and its gray diffraction spot after passing through the Damman vortex grating. Referring to Figure 2(a), it can be seen from the diffracted light field that the incident beam contains +4th order and -4th order orbital angular momentum components. The grayscale image of the diffracted light field is transmitted from the measurement optical system to the host through the data transmission part, and the system in the host that directly obtains the orbital angular momentum spectrum based on the far-field diffraction light field of the Damman vortex grating is shown in Figure 5(a) The grayscale diffraction spot is analyzed. In this ...

Embodiment 2

[0051] Embodiment 2: Measurement of the orbital angular momentum spectrum of a vortex beam whose orbital angular momentum components are respectively +4 order and -4 order and the ratio is 1:2.

[0052] Figure 6(a) shows the light field distribution of a vortex beam whose orbital angular momentum components are +4 and -4 and the ratio is 1:1, and its gray diffraction spot after passing through the Damman vortex grating. Referring to Figure 2(a), it can be seen from the diffracted light field that the incident beam contains +4th order and -4th order orbital angular momentum components. The grayscale image of the diffracted light field is transmitted from the measurement optical system to the host computer through the data transmission part, and the system in the host computer that directly obtains the orbital angular momentum spectrum based on the far-field diffraction light field of the Damman vortex grating is shown in Figure 6(a) The grayscale diffraction spot is analyzed. ...

Embodiment 3

[0053] Embodiment 3: Measurement of the orbital angular momentum spectrum of a vortex beam whose orbital angular momentum components are respectively -9 order, -2 order and +6 order and the ratio is set randomly.

[0054] Fig. 7(a) shows the light field distribution of the vortex beam whose orbital angular momentum components are -9 order, -2 order and +6 order and the ratio is set randomly, and its gray level after passing through the Damman vortex grating Diffraction spots. Referring to Figure 2(a), it can be seen from the diffracted light field that the incident light beam contains -9 order, -2 order and +6 order orbital angular momentum components. The grayscale image of the diffracted light field is transmitted from the measurement optical system to the host computer through the data transmission part, and the system in the host computer that directly obtains the orbital angular momentum spectrum based on the far-field diffraction light field of the Damman vortex grating ...

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Abstract

The invention discloses a device and system for measuring the orbital angular momentum spectrum of a light beam. The device just needs to enable a to-be-measured light beam to be transmitted in an optical axis direction of a system, and obtains a far-field diffraction spot gray scale pattern at a receiving end. The orbital angular momentum spectrum of the incident light beam can be obtained through a calculation system provided by the invention. The device is very simple, and the optical path is easy to adjust. The device is higher in operability, and just needs to obtain the far-field diffraction spot gray scale pattern, wherein other operations are automatically completed by a host. Compared with the conventional technology of orbital angular momentum spectrum measurement, the device and system are improved greatly. The device and system can be used for the technology of light communication, the field of quantum information processing and the technology of optical tweezers.

Description

technical field [0001] The invention relates to the field of optoelectronic technology, in particular to a device and system for measuring the orbital angular momentum spectrum of light beams. Background technique [0002] Angular momentum is one of the most basic physical quantities in physics, which can be used to describe the rotational motion of an object. Angular momentum can be divided into spin angular momentum and orbital angular momentum. For photons, the spin angular momentum macroscopically appears as a circular polarization state, while the orbital angular momentum appears as the helical wavefront of the beam. For a beam carrying orbital angular momentum, because it has a helical wavefront, there will be a phase singularity in the center of the beam, that is, there is no light intensity in the center of the beam, and its cross-sectional light intensity distribution is a ring. Beams carrying orbital angular momentum are also called vortex beams. Common beams ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J1/00G01J1/04
CPCG01J1/00G01J1/0407
Inventor 高春清付时尧张世坤
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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