Vortex light beam topology charge measuring method based on hexagram hole diffraction
A vortex beam and measurement method technology, applied in the direction of instruments, etc., can solve the problems of topological load measurement errors and high requirements for optical path adjustment, and achieve the effect of simple principle and accurate measurement
Inactive Publication Date: 2016-03-30
HENAN UNIV OF SCI & TECH
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However, both of these methods are realized by measuring the number of interference / diffraction fringes, which requires a high level of adjustment of the optical path of the tester, which can easily lead to misjudgment, which leads to errors in the measurement of the topological charge value
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[0031] The present invention will be further explained below in conjunction with examples.
[0032] As attached figure 1 As shown, the measuring device used in the method for measuring the topological charge value of the vortex beam based on the hexagonal star hole diffraction includes a continuous wave laser 100. In this embodiment, the continuous wave laser 100 selects a laser with a wavelength of 632.8 nm and a power of 3 mW; The beam emitted by the continuous wave laser 100 is irradiated on the collimating beam expander 110, and the expanded beam is transformed into linearly polarized light after passing through the polarizer 121, and then irradiated on the beam splitter 130;
[0033] After passing through the beam splitter 130, the light beam is divided into two beams, one is reflected light and the other is transmitted light; the reflected light beam irradiates the reflective spatial light modulator 210, and is reflected by the reflective spatial light modulator 210 After pa...
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Abstract
The invention relates to a vortex light beam topology charge measuring method based on hexagram hole diffraction. The measuring method comprises the steps: a CW laser power supply is switched on, wherein the light beam emitted from the CW laser irradiates a collimating and beam expanding device and the expanded light beam becomes linearly polarized light through a polarizer and then the linearly polarized light irradiates a beam splitter mirror; the reflected light beam irradiates a reflecting spatial light modulator, and then the reflected light beam is reflected by the reflecting spatial light modulator, and then the reflected light beam irradiates a diaphragm through the beam splitter mirror and a polarization analyzer, wherein the diaphragm is used for selecting a first-order diffracted light beam of a diffracted light field of the reflecting spatial light modulator as a vortex light beam; the vortex light beam is a topology charge vortex light beam to be detected; and the vortex light beam irradiates a transmission-type spatial light modulator, and the Fraunhofer diffracted light of the transmission-type spatial light modulator can be stored in a computer through images recorded by a CCD camera, so that a topology charge m of the vortex light beam to be detected can be obtained. The vortex light beam topology charge measuring method based on hexagram hole diffraction can quickly and accurately measure the topology charge of the vortex light beam, and has the advantages of being simple in principles and being quick and efficient.
Description
Technical field [0001] The invention relates to a method for measuring the topological charge of a vortex beam, in particular to a method for measuring the topological charge of a vortex beam based on a template comparison method based on a hexagonal star hole Fraunhofer diffraction pattern. Background technique [0002] Since Nye and Berry published an article on the phase singularity, the optical vortex has attracted a lot of attention. Optical vortices have important applications in many different research fields such as quantum information encoding, micro-manipulation of particles, beam knotting, image processing and other fields. An optical vortex has a unique spiral phase exp(jmθ), and each photon carries The orbital angular momentum of, where m is the topological charge of the vortex beam. When studying the characteristics and applications of vortex beams, accurate measurement of the topological charge of the generated vortex beams is the first problem that needs to be s...
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Login to View More IPC IPC(8): G01J11/00
CPCG01J11/00
Inventor 李新忠台玉萍李贺贺王静鸽张利平甄志强尹传磊
Owner HENAN UNIV OF SCI & TECH