Method and system for generating double-exponential Bessel Gaussian beam

A Gaussian beam, double-exponential technology, applied in optics, optical components, instruments, etc., can solve many problems such as inability to achieve, reduce the utilization rate of light energy consumption, and inability to control the amplitude of Bessel beams, and achieve the utilization rate of light source energy. High, easy-to-use effects

Pending Publication Date: 2018-01-23
SUZHOU UNIV
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  • Description
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  • Application Information

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Problems solved by technology

[0006] The single spatial light modulator method can only realize the superposition of Bessel beams with the same radial wave vector, and cannot control the amplitude of Bessel beams
[0007] In addition to the above two shortcomings, the vector Bessel superpositi

Method used

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  • Method and system for generating double-exponential Bessel Gaussian beam
  • Method and system for generating double-exponential Bessel Gaussian beam
  • Method and system for generating double-exponential Bessel Gaussian beam

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Effect test

Embodiment 1

[0057] Such as figure 1 As shown, the present embodiment generates a double-exponential Bessel Gaussian beam method, which is realized by the following device,

[0058] Light source: linearly polarized Gaussian beam, wavelength: 400nm-800nm

[0059] Vortex phase plate: It is a transparent plate with a fixed refractive index, one end of which is a regular planar structure, and the other end is an irregular vortex surface structure similar to a rotating step. The thickness of the vortex surface will increase with the azimuth angle and increase; it will basically not change the light intensity of the transmitted beam, and is mainly used to introduce the phase factor exp(ilφ), l is the topological charge, and φ is the azimuth along the center point of the phase plate as the origin, which is a pure phase modulation tool;

[0060] Transmissive amplitude spatial light modulator: used to control the amplitude distribution and size of the angular spectrum function of the double-expon...

Embodiment 2

[0068] The present embodiment produces the method for double-exponential Bessel Gaussian beam, on embodiment 1, described Gaussian beam first passes through attenuation plate before passing through vortex phase plate, adjusts the light intensity of outgoing fundamental mode Gaussian beam, then passes through beam expansion The mirror expands the spot size of the Gaussian beam and collimates the Gaussian beam.

[0069] In this embodiment, the light intensity of the double-exponential Bessel-Gaussian beam recorded at the Fourier plane is also included.

Embodiment 3

[0071] Such as figure 1 As shown, the present embodiment produces a system for double-exponential Bessel Gaussian beams, including:

[0072] Light source: linearly polarized Gaussian beam, wavelength: 400nm-800nm;

[0073] A vortex phase plate, a transmission amplitude spatial light modulator, and a Fourier lens are sequentially arranged along the transmission direction of the polarized Gaussian beam.

[0074] Vortex phase plate: It is a transparent plate with a fixed refractive index, one end of which is a regular planar structure, and the other end is an irregular vortex surface structure similar to a rotating step. The thickness of the vortex surface will increase with the azimuth angle and increase; it will basically not change the light intensity of the transmitted beam, and is mainly used to introduce the phase factor exp(ilφ), l is the topological charge, and φ is the azimuth along the center point of the phase plate as the origin, which is a pure phase modulation too...

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Abstract

The invention relates to a method and a system for generating a double-exponential Bessel Gaussian beam, which is designed for realizing superposition of multiple Bessel Gaussian beams with differenttransverse wave vectors and specific amplitude. A linearly-polarized Gaussian beam firstly passes through a vortex phase plate, a phase factor is introduced to the linearly-polarized Gaussian beam, and a Gaussian vortex beam is generated; the Gaussian vortex beam then passes through an amplitude spatial light modulator which is loaded with at least two circular amplitude holograms, through regulating the transmittance of the circular amplitude hologram, the amplitude of the Gaussian vortex beam (the double-exponential Bessel Gaussian beam) is further regulated, and a double-exponential BesselGaussian beam angular spectrum function is generated; and finally, Fourier transform is carried out to generate the double-exponential Bessel Gaussian beam. The double-exponential Bessel Gaussian beamsuperposition flexibility is higher, and the operation of generating the double-exponential Bessel Gaussian beam is simple.

Description

technical field [0001] The invention relates to a method and system for generating double-exponential Bessel Gaussian beams. Background technique [0002] Since Durnin proposed and experimentally generated Bessel beams, a great deal of work has been devoted to studying this particular beam because of its two main properties, non-diffraction and self-healing. These characteristics make Bessel beams have important applications in particle acceleration, medical imaging, material detection, optical micromanipulation, optical trapping and other fields. Since the ideal Bessel beam has an infinite radial direction and carries infinite energy, the ideal Bessel beam cannot be produced in physics, so only approximate Bessel beams can be produced in the experiment. These approximate Bessel beams can have the main characteristics of Bessel beams in a fairly long propagation distance, and Bessel Gaussian beams are one of them, and they are also very easy to produce experimentally. Expe...

Claims

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Application Information

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IPC IPC(8): G02B27/09
CPCY02D30/70
Inventor 姚海南王飞蔡阳健
Owner SUZHOU UNIV
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