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Vortex light interferometry method and system

An interferometry and vortex light technology, which is applied in the field of vortex light interferometry, can solve the problems that the symbol of topological charge cannot be measured and is complicated, and achieves the effects of convenient operation, reasonable overall design and simple structure.

Active Publication Date: 2018-10-19
GUANGDONG INCUBATOR TECH DEV CO LTD
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Problems solved by technology

However, these measurement methods can only obtain the order of the topological charge, and there is no way to measure the sign of the topological charge, and because the system includes devices such as Duff prisms, the system has interference introduced by devices and is somewhat complicated

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  • Vortex light interferometry method and system
  • Vortex light interferometry method and system
  • Vortex light interferometry method and system

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Embodiment Construction

[0035] The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing

[0036] The following is attached figure 1 -6 The specific embodiment of the present invention is described further:

[0037] Refer to attached figure 1 As shown, a vortex light interferometry system includes a vortex light generation unit 10 , a control unit 20 , a vortex light modulation unit 30 , a conjugate vortex light interference unit 40 and an image acquisition unit 50 .

[0038] Wherein the vortex light generation unit 10 is used to generate a vortex beam, which includes a pumping light source LD101, a beam expander BE102, a computer-controlled spatial light modulator SLM103 and a first total reflection mirror M1 104; the control unit 20 consists of The grating crystal switch GCCD is used to change the propagation optical path of the vortex light. When the control signal is set, the vortex light beam is reflected and transmitted; when the...

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Abstract

The invention discloses an interference measurement method and an interference measurement system for a vortex beam. The interference measurement system comprises a vortex beam generating unit, a control unit, a vortex beam modulation unit, a conjugate vertex beam interference unit and an image acquisition unit. The vortex beam generating unit is used for generating a vortex beam. The control unit is used for changing the propagation optical path of the vortex beam. The vortex beam modulation unit is used for modulating the topological charge of the vortex beam. The conjugate vertex beam interference unit is used for splitting one vortex beam to two split vortex beams and converting one split vortex beam to the conjugate vortex beam of the other split vortex beam, and then performing interference on the split vortex beam and the conjugate vortex beam. The image acquisition unit is used for acquiring an interference strength graph of the two conjugate vortex beams and acquiring the order and the symbol of the topological charge of the vortex beam through analyzing the acquired data. The invention provides the simple integer and semi-integer topological charge interference measurement system without an interference influence introduced by a device through an improved M-Z interferometer and a square loop device which carries a vortex phase plate (VPP).

Description

technical field [0001] The invention relates to the field of free space communication and quantum communication network, in particular to a method and system for interferometric measurement of vortex light. Background technique [0002] In 1992, Allen's team at Leiden University in the Netherlands theoretically proved that photons contain a certain orbital angular momentum (Orbital Angular Momentum, OAM) A photon OAM value is Corresponding to the spiral isophase surface, the spiral phase term is exp(ilφ), l is the OAM topological charge, the positive and negative signs of l represent different rotation directions, and φ is the polar angle in the polar coordinate system. Vortex light with OAM has potential applications in quantum information processing, atomic manipulation, micromanipulation and life sciences, and remote sensing. Therefore, it is of great significance to accurately measure the topological charge of vortex light. [0003] The measurement of vortex phototo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J9/02
CPCG01J9/02
Inventor 郭邦红郭建军范榕华张文杰王钰张立涛张盼盼
Owner GUANGDONG INCUBATOR TECH DEV CO LTD