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Method and device for acquiring Bessel beam based on cross phase modulation

A cross-phase modulation and Bessel beam technology, applied in the field of nonlinear optics, can solve the problems of high price, large optical distortion, and irreconcilable central bright spots, etc., and achieve the effect of reducing operation difficulty, simple experimental equipment, and simple realization

Inactive Publication Date: 2017-04-19
NORTHWEST UNIV
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Problems solved by technology

[0003] Aiming at the problems of large optical distortion and non-adjustable central bright spot when generating Bessel beams in the prior art, complex manufacturing process and high price of spatial light modulator, and complex structure of phonon gradient lens, the purpose of the present invention is to provide a Bessel Beam Obtaining Method Based on Cross Phase Modulation

Method used

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  • Method and device for acquiring Bessel beam based on cross phase modulation
  • Method and device for acquiring Bessel beam based on cross phase modulation
  • Method and device for acquiring Bessel beam based on cross phase modulation

Examples

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Embodiment 1

[0048] Prepare the test device as follows:

[0049] There are 2 lasers, the continuously tunable ring titanium sapphire laser (Matisse TR) emits the light as the modulated laser beam; the external cavity semiconductor laser emits the light as the modulated laser beam.

[0050] Convex lens 1, focal length 500mm.

[0051] 2 half-wave plates.

[0052] Two polarizing beam-splitting cubes.

[0053] Nonlinear medium, rubidium (Rb) atomic pool.

[0054] CCD, for imaging.

[0055] Such as figure 1 As shown, the specific steps of using the method of the present invention to obtain a hollow beam are as follows:

[0056] Step 1: Focus the modulated laser beam 8 emitted by the tunable annular titanium sapphire (Matisse TR) laser with the convex lens 1 to obtain a Gaussian beam with a waist spot size of 172 μm, and set the waist spot position as the coordinate origin; The Gaussian beam is focused in the nonlinear medium 4 after passing through the first half-wave plate 2 and the firs...

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Abstract

The invention discloses a method and device for acquiring a Bessel beam based on cross phase modulation. The method comprises the steps that (1) a modulation laser beam is focused in a nonlinear medium; (2) the modulated laser beam enters the same nonlinear medium in a reverse and co-linear manner, and then is made to enter an imaging device; (3) light intensity of the modulated laser beam is adjusted till an obvious center bright spot and an obvious concentric circle pattern appear on the imaging device which is located in a remote field; and (4) a focal distance of a focusing lens or the position of the nonlinear medium is adjusted, so the Bessel beam with the different center bright spot size can be obtained. The method disclosed by the invention has the advantages of a simple structure, easy operations and controllability of the center bright spot size.

Description

technical field [0001] The invention belongs to the field of nonlinear optics, in particular to a method and device for obtaining a Bessel beam based on cross-phase modulation. Background technique [0002] In the field of optics, a Bessel beam refers to a beam whose transverse amplitude distribution satisfies the Bessel function, and its transverse light intensity distribution appears as a central bright spot and a series of concentric rings. A true Bessel beam does not undergo diffraction, that is, it can maintain its lateral light intensity distribution during its propagation, and it will restore its lateral light intensity distribution when it encounters an obstacle. It is precisely because of the unique light intensity distribution and propagation characteristics of the Bessel beam that it has very important application value in the fields of laser fine processing, optical imaging, particle manipulation, microlithography, and nonlinear optics. At present, the methods t...

Claims

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Application Information

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IPC IPC(8): G02F1/35
CPCG02F1/3501G02F1/3511G02F1/3503
Inventor 程雪梅陈浩伟任兆玉张倩白晋涛
Owner NORTHWEST UNIV
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