Photonic orbital angular momentum spiral spectrum measurement system based on Fourier transform

A technology of orbital angular momentum and Fourier transform, applied in the field of information optics, can solve the problems of high cost and high complexity of the helical spectrum detection method, and achieve the effect of low cost, low cost and simple device

Inactive Publication Date: 2018-05-29
HARBIN INST OF TECH
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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of high complexity and high cost of existing helical spectrum detection methods, thereby providing a photon orbital angular momentum helical spectrum measurement system based on Fourier transform

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  • Photonic orbital angular momentum spiral spectrum measurement system based on Fourier transform
  • Photonic orbital angular momentum spiral spectrum measurement system based on Fourier transform
  • Photonic orbital angular momentum spiral spectrum measurement system based on Fourier transform

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Embodiment Construction

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0018] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0019] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

[0020] A photon orbital angular momentum helicon spectrum measurement system based on Fourier transform, includi...

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Abstract

Disclosed is a photonic orbital angular momentum spiral spectrum measurement system based on Fourier transform. The photonic orbital angular momentum spiral spectrum measurement system based on the Fourier transform relates to the technical field of information optics, and aims at solving the problem that existing spiral spectrum measurement methods are high in complexity and cost. According to the system, a light beam is divided into two lights by a first unpolarized beam splitter, one is transmission light, the other is reflected light, each light path is provided with a Dove prism, the transmission light and the reflected light are reflected by a total reflection mirror to reach a second unpolarized beam splitter, and phases of the transmission light and the reflected light are the samein the second unpolarized beam splitter; two interference lights output by the second unpolarized beam splitter are received by receiving end faces of two photodetectors respectively, and two intensity signals output by the photodetectors are transmitted to a synchronous signal processing system; an orbital angular momentum spiral spectrum is calculated by the synchronous signal processing systemaccording to the synchronously collected intensity signals. The system is applicable to spiral spectrum measurement of echo signals after target detection is performed by adopting the orbital angularmomentum light beam.

Description

technical field [0001] The invention relates to the technical field of information optics, in particular to a helical spectrum detection system for echo signals when orbital angular momentum light beams are used for detection. Background technique [0002] The detection of the helical spectrum distribution of orbital angular momentum has always been a technical problem, because usually different echo signals carry different information, and these information differences are mainly reflected in the helical spectrum distribution. There are two main methods for the existing helical spectrum detection , the first one is to use the spatial light modulator to continuously change the loading pattern, and determine the weight of each orbital angular momentum quantum number beam one by one, but because the spatial light modulator is a liquid crystal device, there is diffraction phenomenon, and the conversion efficiency cannot reach 100%. The measurement results are not ideal. It is r...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J3/28G01J1/42
CPCG01J1/42G01J3/2803
Inventor 张子静靳辰飞张建东赵远宋杰
Owner HARBIN INST OF TECH
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