Method and device for realizing demodulation of mixing auger phase light beam orbit angular momentum state

An orbital angular momentum and hybrid spiral technology, which is used in measurement devices, light demodulation, interferometric spectroscopy, etc. Orbital Angular Momentum, etc.

CN101587281AInactive Publication Date: 2009-11-25BEIJING INSTITUTE OF TECHNOLOGYGY
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2009-11-25
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a method and device for realizing the demodulation of the orbit angular momentum state of the mixing auger phase light beam containing a plurality of orbit angular momentum states. the device comprises four 50 / 50 beam splitters, two 45 DEG total reflectors, two Dove prisms, two diffraction grids, two convex lenses, two CCD detectors and two energy meters. in the invention, the separation of the different angular-momentum quantum number helical light is realized, the measuring of each helical component energy in the light beam is realized, the measuring of the orbit angular momentum state containing the helical component in the light beam is realized. in the invention, the Mach-Zehnder interferometer having two arms with Dove prism is adopted for separating the helical component of different angular-momentum quantum number in the light beam, the beam splitter and the energy meter is used for measuring the energy distribution condition of each helical component in the light beam, and the diffraction grid is used for demarcating the separated orbit angular momentum state of the helical component. the invention can be widely used in the light orbit angular momentum information storing and transmitting field.
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Description

technical field

[0001] The invention relates to a method and a device for demodulating the orbital angular momentum state of a mixed helical phase beam containing multiple orbital angular momentum states, belonging to the field of photoelectric application technology. Background technique

[0002] A device that realizes the demodulation of the orbital angular momentum state of a mixed spiral phase beam can measure the orbital angular momentum state of a beam with a single orbital angular momentum state component and multiple mixed orbital angular momentum state components. It has important application prospects in information storage and transmission.

[0003] The orbital angular momentum of light is a physical quantity that describes the characteristics of the helical wavefront of light waves. have Beams of the form phase factor, each photon carrying orbital angular momentum (l is the orbital angular momentum quantum number), there is a phase singularity in the center ...

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Embodiment Construction

[0025] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0026] Such as figure 1 As shown, the device of the present invention includes beam splitters 1, 2, 3, 4, total reflection mirrors 5, 6, Dove prisms 7, 8, diffraction gratings 9, 10, convex lenses 11, 12, CCD detectors 13, 14, energy Count 15, 16. The energy splitting ratio of beam splitters 1, 2, 3, and 4 is 50 / 50. The beam splitting film of beam splitter 1 is located on the front surface of the incident light, forming an angle of 45° with the incident light. The mirrors 1 are parallel to each other, the beam splitters 3 and 4 are respectively located at the two output ends of the Mach-Zehnder interferometer and are perpendicular to each other, the beam splitter 3 and the beam splitter 1 are parallel to each other; the total reflection mirrors 5 and 6 are 45° total reflections, and the reflection The planes are all parallel to the beam sp...