A method and device for measuring beam vortex
A technology for measuring beam and vortex direction, applied in the field of applied optics, can solve the problem of low coherence length beam topological charge and other problems that are not proposed in the literature, and achieve the effect of accurate measurement
Active Publication Date: 2018-09-25
SUZHOU UNIV
View PDF5 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
However, these methods for measuring beam vortex are limited in that they can only measure beams with large coherence lengths using the intensity distribution.
How to measure the topological charge of this broad class of beams has important research value, but so far, no literature has proposed a method and device for how to measure the magnitude and direction of the topological charge of low coherence length beams
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0034] See attached figure 1 , which is a structural schematic diagram of a beam vortex measurement device provided in this embodiment, the device includes: a beam vortex source to be measured 1, a cylindrical mirror 2, a cylindrical mirror 3, a charge-coupled device 4, used for calculation processing microcomputer 5.
[0035] The beam vortex source emitted by the beam vortex source 1 to be measured, the beam vortex source can be any beam carrying a vortex phase; the beam emitted by the beam source is freely transmitted z 0 After passing through the cylindrical mirror 2 (the long axis is placed horizontally or vertically), the focal length of the cylindrical mirror is f 1 ; The light beam modulated by the cylindrical mirror is vertically incident on the cylindrical mirror 3 (the long axis is perpendicular to the long axis of the cylindrical mirror 2), and the focal length of the cylindrical mirror is f 2 ; The light beams modulated by the above two mutually perpendicular ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a method and a device for measuring beam vortex. Its structure is as follows: according to the incident direction of the light beam carrying the vortex, the first cylindrical mirror and the second cylindrical mirror whose long axes are perpendicular to each other are sequentially arranged, and a charge coupled device is arranged on the anti-phase plane far from the second cylindrical mirror, The light intensity distribution data measured by the charge-coupled device is input into the computer. According to the measured light intensity distribution data, the present invention calculates and obtains the two-dimensional distribution of the correlation structure of the light beam on the plane, which is used for judging the number and direction of the vortex carried by the measured light beam. The invention uses an optical system combined with mutually perpendicular cylindrical mirrors and a correlation function calculation method to accurately measure the direction and number of vortices carried by light beams, and is applicable to fields such as information storage, optical communication, and particle manipulation. The measuring device is simple and practical, accurate in measurement and has practical application value.
Description
technical field [0001] The invention relates to a method and device for measuring the vortex of a beam, which can accurately measure the direction and number of the vortex carried by the beam, and is suitable for information storage, optical communication, particle manipulation and other fields, and belongs to the field of applied optics technology. Background technique [0002] A beam vortex refers to a singular point in the light field, at which point the intensity and phase of the light field are not defined. In addition, the wavefront distribution of the light field near this point is helical, so it is named beam vortex. Due to the helical distribution of the phase of the light field, the beam vortex can carry orbital angular momentum. Because of this, the beam vortex has a wide range of application values, such as in the fields of beam capture, atomic manipulation, information storage, and communication technology. It has broad application prospects. According to the g...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): G01J11/00
CPCG01J11/00
Inventor 刘显龙蔡阳健陈君
Owner SUZHOU UNIV