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System and method for generating radial Bessel-Gaussian beam

A technology of Gaussian beams and radially polarized light, applied in optics, optical components, instruments, etc., can solve the problem that radially polarized beams do not have self-healing ability

Inactive Publication Date: 2013-03-20
SUZHOU UNIV
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Problems solved by technology

At the same time, the radially polarized beams they produce do not have self-healing capabilities

Method used

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  • System and method for generating radial Bessel-Gaussian beam
  • System and method for generating radial Bessel-Gaussian beam
  • System and method for generating radial Bessel-Gaussian beam

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Embodiment Construction

[0032] Radially polarized light has been extensively studied, and different generation methods have been reported one after another. But they all produce a single-ring hollow radially polarized beam. At the same time, the radially polarized beams they produce do not have self-healing capabilities. Therefore, this embodiment proposes that radially polarized light beams that can generate multiple rings and have self-healing capabilities are provided. In this embodiment, the calculation holographic grating image is loaded into the spatial light modulator to generate the first-order Bessel Gaussian beam, and then the vortex phase of the first-order Bessel-Gaussian beam is eliminated by a vortex phase plate, and finally the vortex phase is obtained through the radial polarization converter. A radially polarized Bessel Gaussian beam is obtained. This method is not only simple in experimental conditions, but also easy to operate, so it is a relatively good method.

[0033] The tec...

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Abstract

The invention discloses a system for generating a radial Bessel-Gaussian beam. The system comprises a beam expander, a computer-controlled spatial light modulator, a vortex phase plate and a radial polarization convertor that are sequentially arranged in a light direction of a light source generating linearly polarized light, wherein a topological charge of the vortex phase plate is 1; and a calculation hologram generated by a computer is loaded to the spatial light modulator to form a calculation holographic grating, so that a first order Bessel-Gaussian beam is generated. The vortex phase plate is rotated to ensure that phase structure distribution of the vortex phase plate is right opposite to the phase structure distribution of the Bessel-Gaussian beam coming out of the spatial light modulator, and a vortex phase of the Bessel-Gaussian beam is eliminated. Then, the Bessel-Gaussian beam with the vortex phase being eliminated passes through the radial polarization convertor. Radial polarization Bessel-Gaussian beams with different ring numbers can be generated by generating different holograms due to the flexibility of the holograms of the computer, and have self-restorability.

Description

technical field [0001] The present invention relates to a system and method for generating radially polarized Bessel-Gaussian beams using computational holography, devortex phase and polarization conversion techniques. Background technique [0002] In recent years, hollow beams, as tools such as laser catheters, optical tweezers, and optical wrenches, have been widely used in the research of trapping and manipulating microscopic particles. Bessel beams are a class of hollow beams without diffraction. In 1986, J. Durnin obtained a strict solution from the wave equation. This solution has a very peculiar phenomenon. During the propagation process, its light intensity is equal to the initial light intensity, and the light intensity distribution has nothing to do with its propagation distance. As the propagation distance increases, the beam does not diverge. That is to say, the obtained beam has no diffraction effect. Due to its special nature, Bessel beams show some other ph...

Claims

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Application Information

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IPC IPC(8): G02B27/09G02B27/28G03H1/22
Inventor 王飞吴高峰刘显龙蔡阳健
Owner SUZHOU UNIV
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