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Gradual change refractive index plasma lens-based device and method for generating hollow light beam

A technology of gradient refractive index and hollow beam, which is applied in the field of optics, can solve the problem that the size and shape of black spots cannot be flexibly controlled in real time

Inactive Publication Date: 2013-08-14
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above methods are all based on specific optoelectronic devices, which cannot flexibly control the size and shape of the black spot in the ring beam in real time

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  • Gradual change refractive index plasma lens-based device and method for generating hollow light beam

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Embodiment Construction

[0028] The present invention will be described in detail below in conjunction with specific embodiments and accompanying drawings.

[0029] Such as figure 1 As shown, the device for generating a hollow beam based on a graded-index plasma lens in this embodiment includes a helium-neon laser light source 1, an ultrashort pulse light source 2, optical attenuation sheets 3a-3b, a spatial light modulator 4, and mirrors 5a- 5b, dichroic mirrors 6a-6b, nonlinear liquid medium 7, shading plate 8, precision detector 9, plasma channel 10, hollow beam 11.

[0030] The functions of the above parts are described as follows:

[0031] He-Ne laser light source 1, used to generate probe light;

[0032] Ultrashort pulse light source 2, used to generate pump light;

[0033] The optical attenuation sheet 3a is used to adjust the power of the ultrashort pulse incident to the nonlinear medium;

[0034] The optical attenuation sheet 3b is used to adjust the power incident to the precision detect...

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Abstract

The invention discloses a gradual change refractive index plasma lens-based device and method for generating a hollow light beam. The gradual change refractive index plasma lens-based device for generating the hollow light beam comprises a He-Ne laser source, an ultra-short pulse light source, an optical attenuation piece, a space light modulator, a reflector, a dichroscope, a non-linear liquid medium, a light shielding plate and a precise detector. The invention based on the pumping-detecting and gradual change refractive index plasma lens principle provides the method and device for generating the hollow light beam. Compared with the prior art, the method disclosed by the invention can conveniently and fast control the shape and size of black spots in annular light beams in real time by only changing the input power and focusing state of pumping light.

Description

technical field [0001] The invention relates to the field of optical technology, in particular to a device and method for generating a hollow beam based on a graded-index plasma lens. Background technique [0002] A hollow beam refers to an annular beam with a low or zero central light intensity in the direction of beam propagation. Due to the unique physical properties of hollow beams such as barrel-shaped intensity distribution and transmission invariance, it has broad application prospects in laser optics, super-resolution fluorescence microscopy, optical trapping of microscopic particles, and material science. Many methods can be used to generate hollow beams, such as: axicon method, mode conversion method, computational and optical holography, phase plate method, etc. In addition, research has shown that a laser beam can be coupled into a hollow fiber, a photonic crystal fiber, or a multimode fiber to generate a hollow-core beam. Recently, the American Journal of Opti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/09
Inventor 谭超傅喜泉
Owner HUNAN UNIV
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