Method for generating vortex light beam by use of calculation hologram

A technology for calculating holograms and vortex beams, applied in optics, optical components, complex mathematical operations, etc., can solve problems such as side lobes cannot be completely eliminated, and achieve fast and simple algorithm implementation

Inactive Publication Date: 2014-08-13
SHANGHAI UNIV
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Problems solved by technology

[0015] Several methods described in the above literature can suppress the side lobe of the optical vortex, but cannot completely eliminate the side lobe

Method used

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  • Method for generating vortex light beam by use of calculation hologram
  • Method for generating vortex light beam by use of calculation hologram
  • Method for generating vortex light beam by use of calculation hologram

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Embodiment Construction

[0051] A preferred embodiment of the present invention is described in detail as follows:

[0052] The technical solutions of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0053] Such as figure 1 As shown, a method for generating a vortex beam using a computational hologram, the specific steps are as follows:

[0054] (1), using the source plane (z = 0 m ) coordinate system of a single-ring Laguerre-Gaussian (LG) vortex beam, where the number of topological charges is l The light intensity distribution and phase distribution of the vortex beam are shown in Fig. 3(a) and Fig. 3(b), and their expressions are:

[0055] (1)

[0056] in, ( , ) is a Laguerre-Gaussian (LG) vortex beam, , are cylindrical coordinate parameters, respectively, is the spot size parameter of the vortex beam, is the wave number, is the radius of curvature of the beam wavefront, is the Gouy phase, is the Rayl...

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Abstract

The invention discloses a method for generating a vortex light beam by use of a calculation hologram. The steps comprise: (1), utilizing a monocyclic Laguerre-Gaussian (LG) vortex light beam in a source plane (z=0m) coordinate system; (2), performing conjugate symmetrical extension on the complex amplitude of the vortex light beam, and obtaining symmetrical vortex light beam complex amplitude distribution; (3), performing Fourier transformation on the conjugate symmetrical vortex light beam complex amplitude distribution to obtain two-dimensional discrete real function distribution, performing DC component inhibition on real functions, and coding to form the vortex light beam calculation hologram; (4), performing Fourier inverse transformation on the calculation hologram, obtaining the light intensity distribution and the phase distribution of the vortex light beam, and taking the left half portions of the light intensity distribution and the phase distribution as the vortex light beam for digital reconstruction; and (5), loading the vortex light beam calculation hologram on a spatial light modulator, modulating incident laser and reconstructing the vortex light beam in a photoelectric mode. The method employs a conjugate symmetrical extension Fourier calculation holographic algorithm, the algorithm is rapid and simple, the calculation efficiency is high, and sidelobe-free high-quality vortex light beams can be generated.

Description

technical field [0001] The present invention relates to a new method for generating vortex beams using computational holograms. Background technique [0002] Vortex beam is a special form of beam # , which has a spiral phase factor term , the optical phase center is the phase singularity, where the light intensity disappears due to self-destructive interference of the beam, It is called the topological charge number of the vortex beam, and the gradient of the phase gradient rotating around the phase singularity is . Allen published "Orbital angular momentum of light and the transformation of Laguerre-Gaussian laser modes" in Physical Review A magazine 45(11): 8185-8189 in 1992, which proved that each photon in the above-mentioned vortex beam carries The size of the orbital angular momentum. [0003] In recent years, due to the potential application value, vortex beams have been widely studied and applied in the field of optics. The orbital angular momentum of vortex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/09G06F17/14
Inventor 黄素娟贺超王廷云谷婷婷
Owner SHANGHAI UNIV
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