Measuring device and measuring method for Laguerre Gaussian beam high-order topological charge
A measuring device, Gaussian beam technology, applied in the field of light measurement, achieves the effect of low cost and simple operation
Pending Publication Date: 2022-07-08
HEFEI UNIV OF TECH
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The Laguerre-Gaussian beam has mirror property, and interference with its mirrored Laguerre-Gauerian beam can produce a chrysanthemum-like petal interference pattern uniformly distributed on the circumference, and the light field distribution and its topological charge There is a certain relationship between the signs of , but the measurable topological charge is ±9 only by observing the light field distribution after diffraction by an equilateral triangular hole
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[0051] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.
[0052] like figure 1 As shown, the present invention is a measuring device for measuring the high-order topological charge of a Laguerre Gaussian beam, which is provided with a He-Ne laser He-Ne laser 1 with a wavelength of 632.8 nm, and the He-Ne laser He-Ne laser 1 emits The fundamental mode Gaussian beam is transmitted through the beam splitter I2 and incident on the spatial light modulator 3 to generate the Laguerre-Gaussian beam to be measured; then the Laguerre-Gaussian beam reflected by the spatial light modulator 3 passes through the beam splitter I2. Beam splitter II4; After beam splitter II4, the Laguerre Gaussian beam is divided into a transmitted Laguerre Gaussian beam I and a reflected Laguerre Gaussian beam I, and the transmitted Laguerre Gaussian beam I is reflected by the beam splitter III7 A...
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The invention discloses a Laguerre-Gaussian beam high-order topological charge measuring device and method, a laser emits a light beam, the light beam is transmitted by a beam splitter to reach a spatial light modulator, a Laguerre-Gaussian beam to be measured is generated, the light beam is divided into a transmission Laguerre-Gaussian beam and a reflection Laguerre-Gaussian beam after passing through the beam splitter, and the transmission Laguerre-Gaussian beam and the reflection Laguerre-Gaussian beam are connected with the spatial light modulator. The transmission Laguerre-Gaussian beam is reflected by a beam splitter and then is reflected by a plane mirror to serve as a mirror light beam of the Laguerre-Gaussian beam to irradiate the beam splitter, and the Laguerre-Gaussian beam transmitted by the beam splitter is diffracted by an equilateral triangle hole to enter a CCD camera for imaging; the reflected Laguerre-Gaussian beam passes through a reflector and then is irradiated on a beam splitter as a Laguerre-Gaussian beam; the Laguerre Gaussian beam and a mirror light beam thereof are subjected to interference superposition through a beam splitter; the light intensity obtained after interference superposition enters a CCD camera for imaging, and the size and symbol of vortex light topological charges are obtained by analyzing the collected interference intensity pattern and diffraction intensity pattern.
Description
technical field [0001] The invention relates to the technical field of optical measurement, in particular to a measuring device and a measuring method for the high-order topological charge of a Laguerre Gaussian beam. Background technique [0002] The Laguerre Gaussian beam has a helical phase wavefront, and it has a phase singularity, that is, the central light intensity is zero, and its light field expression contains the Hilbert phase factor of exp(ilθ). The biggest difference between the beams is that the Laguerre-Gaussian beam has orbital angular momentum, and each photon carries lħ orbital angular momentum, where l is the topological charge of the Laguerre-Gaussian beam and ħ is the reduced Planck constant. Laguerre Gaussian beams have the unique properties of orbital angular momentum, and have important applications and research significance in the fields of optical micromanipulation and quantum information encoding. At present, there are many methods to measure th...
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IPC IPC(8): G01J9/02
CPCG01J9/02G01J2009/0223
Inventor 夏豪杰倪岚霖许非凡李维诗赵会宁常松涛
Owner HEFEI UNIV OF TECH