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Single-mode active fiber core external cavity coupled multimode active fiber core ultra-brightness single-mode laser

A laser and fiber core technology, applied in the field of high-power fiber lasers, can solve the problems of poor output beam quality, achieve high yield, achieve ultra-brightness amplification output, and high-efficiency pumping effects

Inactive Publication Date: 2011-11-30
BEIJING JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to overcome the limited output single-mode laser power of the existing traditional double-clad single-mode fiber laser, as well as the increase in optical power, the quality of the output beam becomes poor, and the defects of heat resistance, etc., the authorized announcement number: CN100559670C, announcement date : On November 11, 2009, provided "a single-mode active fiber associated coupling multimode active fiber ultra-brightness single-mode laser" to achieve high-power ultra-brightness single-mode laser output

Method used

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  • Single-mode active fiber core external cavity coupled multimode active fiber core ultra-brightness single-mode laser
  • Single-mode active fiber core external cavity coupled multimode active fiber core ultra-brightness single-mode laser
  • Single-mode active fiber core external cavity coupled multimode active fiber core ultra-brightness single-mode laser

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Embodiment 1

[0018] In this embodiment, the doping ions of the single-mode active rare-earth-doped fiber core 4 and the multi-mode active rare-earth-doped fiber core 6 are all erbium ions, see figure 1 and figure 2 , the detailed description is as follows:

[0019] The single-mode active rare-earth-doped fiber core 4 has a diameter of 5 μm, the multi-mode active rare-earth-doped fiber core 6 has a diameter of 80 μm, and the minimum distance between the outer surfaces of the two cores is 5 μm.

[0020] On a section perpendicular to the axis of the laser, the center of gravity of the single-mode active rare-earth-doped fiber core 4 and the center of gravity of the multi-mode active rare-earth-doped fiber core 6 are aligned with the center of the inner cladding 2 .

[0021] The axes of the single-mode active rare-earth-doped fiber core 4 and the multi-mode active rare-earth-doped fiber core 6 are parallel to the axis of the double-clad fiber, and the double-clad fiber with an inner cladding...

Embodiment 2

[0029] In this embodiment, the doping ions of the single-mode active rare-earth-doped fiber core 4 and the multi-mode active rare-earth-doped fiber core 6 are all ytterbium ions, see image 3 and Figure 4 , the detailed description is as follows:

[0030] The single-mode active rare-earth-doped fiber core 4 has a core diameter of 4 μm, and the multi-mode active rare-earth-doped fiber core 6 is an elliptical fiber core whose major axis has a total length of 80 μm and whose short axis has a total length of 30 μm.

[0031] On a section perpendicular to the axis of the laser, the center of the single-mode active rare-earth-doped fiber core 4 and the center of the ellipse of the multi-mode active rare-earth-doped fiber core 6 are aligned with the center of the inner cladding 2 .

[0032] The distance between the center of the single-mode active rare-earth-doped fiber core 4 and the center of the ellipse of the multi-mode active rare-earth-doped fiber core 6 is 60 μm.

[0033] Th...

Embodiment 3

[0040] In this embodiment, the single-mode active rare-earth-doped fiber core 4 and the multi-mode active rare-earth-doped fiber core 6 have the same type of doped rare-earth ions, and the doped rare-earth ion type is erbium ion or ytterbium ion or holmium ion or thulium ion or neodymium ion ions or erbium-ytterbium codoped ions, see Figure 5 and Figure 6 , the detailed description is as follows:

[0041] The single-mode active rare-earth-doped fiber core 4 has a core diameter of 1 μm, and the multi-mode active rare-earth-doped fiber core 6 is a rectangle with a size of 100 μm×40 μm.

[0042] On a section perpendicular to the axis of the laser, the center of gravity of the single-mode active rare-earth-doped fiber core 4 and the center of gravity of the multi-mode active rare-earth-doped fiber core 6 are aligned with the center of the inner cladding 2 .

[0043] The distance between the center of the single-mode active rare-earth-doped fiber core 4 and the center of gravit...

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Abstract

A single-mode active fiber core external cavity coupled multi-mode active fiber core ultra-brightness single-mode laser belongs to the field of high-power fiber lasers, and it includes a pump source and a double-clad active fiber; the double-clad active fiber includes A single-mode active rare-earth-doped fiber core (4), a multi-mode active rare-earth-doped fiber core (6), inner cladding (2) and outer cladding (3); A diffractive optical element is placed on one end of the high reflection film (8) of the wavelength, and the diffractive optical element is composed of three parts: the first beam splitter (91), the second beam splitter (92) and the beam combiner (93); The operating wavelength of the optical element is the corresponding laser wavelength. The invention realizes the external cavity coupling between the single-mode active rare-earth-doped fiber core and the multi-mode active rare-earth-doped fiber core, and reduces the gap between the surface of the single-mode active rare-earth-doped fiber core and the multi-mode active rare-earth-doped fiber core. The distance requirement reduces the difficulty of the process, and has the advantages of high yield and high efficiency pumping.

Description

technical field [0001] The invention relates to a single-mode active fiber core external cavity coupled multi-mode active fiber core ultra-brightness single-mode laser, which belongs to the field of high-power fiber lasers. Background technique [0002] With its excellent performance and low price, fiber laser has been widely used in optical fiber communication, industrial processing, medical treatment, military and other fields. Although a single-mode laser with a single fiber output exceeding 1kW has been achieved in the laboratory, and the realization of this laser requires strict conditions, it is difficult for engineering applications; but with the development of laser technology applications, as well as material processing, space communications, laser radar, optoelectronics The development of countermeasures and laser weapons requires high-power, high-quality, high-intensity and ultra-brightness lasers, and requires single-mode output power to reach MW or even GW level...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/067H01S3/08H01S3/09H01S3/10H01S3/098
Inventor 胡旭东宁提纲裴丽周倩李晶张帆王春灿魏淮郑凯
Owner BEIJING JIAOTONG UNIV
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