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All-fiber Bessel light beam generator

A generator and all-fiber technology, applied in the optical field, can solve problems such as difficult alignment, high manufacturing difficulty, and system instability, and achieve the effects of solving damage, flexible operation, and improving working power

Inactive Publication Date: 2014-12-03
无锡万润光子技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although there are many Bessel beam generators based on optical fiber structure at present, most of them need to add optical fiber microlenses, and adding optical fiber microlenses will bring disadvantages such as high manufacturing difficulty, difficult alignment or system instability. Therefore, the present invention A section of graded-index fiber is used to replace the fiber microlens, which not only overcomes the above shortcomings, but also retains the characteristics of the all-fiber beam generator

Method used

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Embodiment 1

[0026] 1. Optical fiber connection 1: Take a standard single-core optical fiber 1 and an inner wall waveguide capillary optical fiber 4, first remove the coating layer, cut and polish the side, and then align and weld them, such as Figure 7 shown;

[0027] 2. Coupling connection: in Figure 7 The shown welding spot 15 is heated to a softened state, and then tapered;

[0028] 3. Encapsulation protection: adjust the quartz tube whose inner diameter is larger than the standard single-core optical fiber or the inner wall waveguide capillary optical fiber to Figure 8 shown at the cone coupling region 16, and then at both ends of the quartz tube with CO 2 The laser is heated, welded and sealed, or encapsulated and cured with epoxy resin, and then secondly coated to complete the overall protection, thus preparing the coupling connection parts between the standard single-core optical fiber and the inner wall waveguide capillary optical fiber;

[0029] 4. Optical fiber connection ...

Embodiment 2

[0032] Same as embodiment 1, the inner wall waveguide type capillary fiber 4 is replaced by the wall waveguide type capillary fiber 13 or M type waveguide fiber 14, as Figure 10 and 11 shown.

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Abstract

The invention provides an all-fiber Bessel light beam generator which is composed of a standard single-core fiber, an annular core fiber and a graded index fiber. When light wave is input to the single-core fiber, the transmission light wave can be coupled to the annular core fiber to form an annular light field, then the annular light field is formed into the Bessel light beam at a fiber end through the equivalent Fourier expansion optical transformation of the graded index fiber. Due to the light beam generator provided by the invention employing an all-fiber system, the graded index fiber is used for realizing a function of the lens, the whole generator is easy to align and is more stable compared with the traditional geometry optical system. In addition, the light beam generator has the characteristics of minimal structure, agile operation and strong anti-interference capability. The light beam generator can be applied to the fields of light beam generation, particle controlling and sensing and the like.

Description

(1) Technical field [0001] The invention belongs to the field of optical technology, and relates to an all-fiber Bessel beam generator, which can be applied to beam generation, particle manipulation, sensing applications and the like. (2) Background technology [0002] A light wave that remains unchanged during propagation is considered a non-diffraction beam, and the most typical example of a non-diffraction wave is a Bessel beam. Durnin first proposed the mathematical model of Bessel beams in 1987. We know that the Whitaker solution of the Helmholtz equation has a special solution in the form of Bessel, which has nothing to do with the direction of transmission. However, this Bessel beam of infinite energy cannot be realized in reality. Therefore, Durnin and colleagues (J.Durnin, J.Opt.Soc.Am.A, 1987, 4(4):651-654.) A quasi-Bessel beam with finite energy is obtained, which has the characteristics of a Bessel beam within a certain transmission distance, without diffractio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/122G02B6/028
Inventor 苑立波邓洪昌
Owner 无锡万润光子技术有限公司
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