Femtosecond laser processing method of optical fiber lens

A technology of femtosecond laser processing and fiber optic lens, which is applied in the direction of cladding optical fiber, optical waveguide light guide, laser welding equipment, etc., can solve the problems of optical fiber end face deformation, etc., to avoid stress damage, high processing accuracy, and avoid long-pulse laser thermal effect Effect

Inactive Publication Date: 2019-11-05
XI AN JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since long-pulse or continuous laser processing of optical fibers is mainly due to the thermal effect of the material after the laser is absorbed, the thermal effect generated in this laser processing can easily cause deformation of the fiber end face.

Method used

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  • Femtosecond laser processing method of optical fiber lens
  • Femtosecond laser processing method of optical fiber lens
  • Femtosecond laser processing method of optical fiber lens

Examples

Experimental program
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Embodiment 1

[0066] The embodiments of the present invention use a femtosecond laser with a repetition rate of 1 kHz combined with hydrofluoric acid chemical corrosion to prepare a spherical fiber optic lens, specifically as follows:

[0067] Original material: Single-mode silica fiber.

[0068] The preparation steps of the tapered optical fiber convex lens are described in detail as follows:

[0069] (1) The single-mode quartz optical fiber 1 is cut out with a cutting knife to form a flat fiber end face, and then fixed on the five-dimensional electric displacement stage 3, as figure 1 shown;

[0070] (2) The repetition frequency of the femtosecond laser 4 is 1 kHz, the pulse width is 50 fs, and the power is set to 5 mW. A microscopic objective lens 2 with 20× and a numerical aperture of 0.3 is selected to focus the femtosecond laser 4 inside the optical fiber 1 through the microscopic objective lens 2 . The focusing position of the femtosecond laser 4 in the optical fiber is controlled...

Embodiment 2

[0075] In the embodiment of the present invention, a fiber lens embryo is etched by layer-by-layer scanning with a femtosecond laser, and then etched to produce a fiber lens.

[0076] Original material: Single-mode silica fiber.

[0077] (1) Fixing of the silica optical fiber 1 refers to the corresponding process of the first embodiment.

[0078] (2) The femtosecond laser 4 is focused on the end face of the fiber through the F-theta lens, and the femtosecond laser is scanned and processed on the end face of the fiber by means of a scanning galvanometer, and the end face of the fiber is removed layer by layer to form a tapered fiber lens embryo, see Figure 5 (a), the scanning speed is 50 μm / s, the cone angle is set to 30°, the laser power is 10 mW, and the repetition rate is 1 kHz.

[0079] (3) The surface of the tapered fiber optic lens blank is still rough. Place the tapered fiber optic lens blank in 5% hydrofluoric acid and corrode for 20 minutes to form a tapered lens with ...

Embodiment 3

[0082] In the embodiment of the present invention, after using femtosecond laser to irradiate the end face of the optical fiber at a fixed point, the concave lens structure is processed by hydrofluoric acid corrosion, the details are as follows:

[0083] Original material: Single-mode silica fiber.

[0084] (1) Fixing of the silica optical fiber 1 refers to the corresponding process of the first embodiment.

[0085] (2) The femtosecond laser 4 is focused on the end face of the optical fiber 1 after being focused by the 20 times microscope objective lens 2. By controlling the five-dimensional electric displacement stage, the femtosecond laser is focused on the end face surface of the optical fiber 1 to be processed. Focus on the center of the fiber core, and control the fixed-point irradiation through the shutter 7 for 10s. The power of the femtosecond laser 4 is set to 10mW, and the numerical aperture of the 20x microscope objective lens 2 is 0.3. Grooves are formed in the fi...

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Abstract

The invention discloses a femtosecond laser processing method of an optical fiber lens. The femtosecond laser processing method comprises the following steps that a focused femtosecond laser is utilized for conducting scanning on an optical fiber according to the profile of a to-be-prepared lens, and a laser focus point irradiation area is subjected to material modification or etching removal; theend face of the treated optical fiber is partially soaked in a hydrofluoric acid solution, and through selective corrosion removal of materials in the modification area, the optical fiber outside theprofile of the lens is separated to form an optical fiber lens prototype; the corrosion time is controlled, so that the surface of the obtained optical fiber lens prototype tends to be smooth, and then the optical fiber lens is formed. According to the processing method, the processing working procedures are simple, the shape of the optical fiber lens is flexible, no heating effect exists duringprocessing, convex-face optical fiber lenses and concave-face optical fiber lenses in various shapes can be prepared on the end face of the optical fiber, the problems of stress damage and thermal ablation deformation occurring to existing preparing methods are solved, and the femtosecond laser processing method an be applied to optical fiber sensing, optical fiber laser devices and other fields requiring optical fiber coupling.

Description

technical field [0001] The invention belongs to the field of optical fiber optics and laser processing, and relates to a processing method for an optical fiber lens, in particular to a method for preparing an optical fiber lens based on femtosecond laser micro-nano processing technology and chemical corrosion, and in particular to a femtosecond laser for an optical fiber lens processing methods. Background technique [0002] A fiber optic lens is an optical component that makes the end face of an optical fiber into a lens structure, and is mainly used for optical coupling in an optical fiber system. Compared with the external microlens coupling method commonly used in traditional optical coupling, lensed fiber has many advantages of flexibility, convenience, integration, packaging, and fabrication. Lensed fibers are widely used in optical communication, optical sensing, fiber laser and other fields. Whether it is from technical research or practical application, it has bee...

Claims

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Application Information

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IPC IPC(8): B23K26/362B23K26/53G02B6/02
CPCB23K26/362B23K26/53G02B6/02
Inventor 陈涛司金海沈天伦侯洵
Owner XI AN JIAOTONG UNIV
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