Method for measuring partially coherent vortex light beam topological charge number

A technology of vortex beam and measuring part, which is applied in the field of partially coherent optical measurement, can solve the problems of low coherence, unrealizable measurement, unrealizable coherent vortex beam measurement, etc., and achieve the effect of convenient data processing and simple measurement method

Inactive Publication Date: 2013-02-27
SUZHOU UNIV
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Problems solved by technology

For the interferometry, in order to realize the measurement of the topological charge of the vortex beam, the beam must produce obvious interference fringes, which requires the vortex beam to have high coherence, while the coherence of the partially coherent vortex be...

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  • Method for measuring partially coherent vortex light beam topological charge number

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Embodiment 1

[0043] See attached figure 1 As shown, it is a schematic structural diagram of a device for measuring the topological charge of a partially coherent vortex beam based on a fourth-order correlation function provided by this embodiment; it includes the generation of a partially coherent vortex beam and the measurement of the topological charge.

[0044] 1. A device for generating partially coherent vortex beams, the structure of which includes:

[0045] Laser 1 is a power-adjustable semiconductor-pumped solid-state laser. The emitted laser beam sequentially passes through focusing convex lens 2, rotating ground glass plate 3, collimating convex lens 4 and Gaussian amplitude filter 5. After passing through beam splitter 6, the reflected light reaches the spatial light modulation Phase modulation is performed after the device 7, and a partially coherent vortex beam is generated by reflection.

[0046] In the device for generating partially coherent vortex beams provided in this e...

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Abstract

The invention discloses a method for measuring partially coherent vortex light beam topological charge number. A measured light beam passes through an imaging convex lens and then passes through a beam splitter to be divided into a transmission light beam and a reflection light beam, optical fiber scanning probes of two single-photon counters are respectively arranged at the centers of the transmission light beam and the reflection light beam, the position of a single-photon counter optical fiber probe is fixed, the position of the other single-photon counter optical fiber probe is regulated to perform point-by-point scanning measurement, correlation function values of the two beams on measuring position points are recorded, a spatial distribution image of a fourth-order correlation function is output through computer processing according to fourth-order correlation function relationship of partially coherent laguerre-gaussian beams, and the topological charge number of the beam to be measured is obtained through the number of dark rings on the image. The method is based on the fourth-order correlation function, a novel method for measuring the partially coherent vortex light beam topological charge number is provided, an adopted measuring device is simple in light path and easy to achieve, measuring method is simple, data processing is convenient, and result is reliable.

Description

technical field [0001] The invention relates to a method for measuring the topological charge of a partially coherent vortex beam, in particular to a method for measuring the topological charge of a partially coherent vortex beam based on a fourth-order correlation function, and belongs to the field of partially coherent optical measurement. Background technique [0002] When a beam has an angular phase distribution (twisted phase or helical phase), such a beam has an angular momentum related to the angular phase distribution, called orbital angular momentum. Vortex beams (such as Laguerre-Gaussian beams) have a phase factor , each photon carries The orbital angular momentum of (where l is the topological charge of the vortex beam). The vortex beam has the characteristic of orbital angular momentum, which makes the vortex beam have great application prospects in optical trapping, micromanipulation, information encoding and free space optical communication, etc., which ha...

Claims

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Application Information

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IPC IPC(8): G01J9/00
Inventor 赵承良董元刘琳王飞蔡阳健
Owner SUZHOU UNIV
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