Fiber laser amplifier with high stimulated Brillouin scattering threshold and high conversion efficiency

A technology of stimulated Brillouin and fiber laser, applied in the direction of laser scattering effect, laser, laser parts, etc., can solve the problems of fiber performance degradation, low conversion efficiency, increased production cost, etc., to improve SBS threshold, SBS The effect of raising the threshold and making the system stable and reliable

Inactive Publication Date: 2020-12-22
武汉光谷航天三江激光产业技术研究院有限公司
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  • Application Information

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Problems solved by technology

However, in the case of high power, the fiber laser amplifier will be limited by the stimulated Brillouin scattering effect (hereinafter referred to as SBS), and it is difficult to increase the output power.
Moreover, in the case of high power, the low conversion efficiency of the laser will convert a large amount of pump light into waste heat, which greatly increases the cooling cost
A variety of schemes have been proposed to suppress the SBS phenomenon in fiber laser amplifiers, such as increasing the doping concentration of the gain fiber to increase the absorption coefficient, shortening the length of the gain fiber to increase the SBS threshold of the laser, but too high a doping concentration will The generation of ion clusters inside the gain fiber degrades the performance of the fiber. At the same time, the use of a gain fiber with an excessively high absorption coefficient can easily reduce the mode instability threshold (MI) of the

Method used

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  • Fiber laser amplifier with high stimulated Brillouin scattering threshold and high conversion efficiency

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Embodiment 1

[0031] A fiber laser amplifier with high stimulated Brillouin scattering threshold and high conversion efficiency, comprising a laser port to be amplified and a forward pumping light port on the laser amplification optical path in sequence (two forward pumping ports are arranged in this embodiment) optical port), forward signal / pump coupler, first fiber Bragg grating, gain fiber, second fiber Bragg grating, reverse pump light port (there are two reverse pump light ports in this embodiment), Reverse signal / pump coupler and amplified laser exit port;

[0032] The gain fiber is coiled and arranged in the same plane to form a fiber disc, and it can also be coiled into a columnar or tapered shape. In this embodiment, the gain fiber is coiled and arranged in the same plane to form a fiber disc; in another embodiment The gain fiber is coiled into a column in the same plane, and in another embodiment, the gain fiber is coiled into a cone in the same plane;

[0033] The gain fiber can...

Embodiment 2

[0040] The difference between this embodiment and Embodiment 1 is that it also includes a first pump optical filter, and the first pump optical filter is arranged between the laser port to be amplified and the forward signal / pump coupler Between, it is used to filter out the remaining reflected pump light a that is not absorbed by the second time. The first pump optical filter includes but is not limited to a mode filter and a cladding optical filter. In this embodiment, it is a cladding optical filter; in another embodiment, it is a mode filter;

[0041] All the other are with embodiment 1.

Embodiment 3

[0043] The difference between this embodiment and Embodiment 2 is that it also includes a second pumping optical filter, and the second pumping optical filter is arranged at the output port of the amplified laser light and the reverse signal / pumping coupler Between, it is used to filter out the remaining reflected pump light b not absorbed by the second time. The second pump optical filter includes but is not limited to a mode filter and a cladding optical filter. In this embodiment, it is a cladding optical filter; in another embodiment, it is a mode filter;

[0044] This embodiment further provides the selected fiber laser amplifier with high stimulated Brillouin scattering threshold and high conversion efficiency, the first pump coupler and the second pump coupler are (6+1)×1 pump Coupler, the output fiber core size is 30μm, the inner cladding size is 400μm; the gain fiber is a large mode field double-clad ytterbium-doped fiber, the length is 5m, the core size is 30μm, the ...

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Abstract

The invention discloses a fiber laser amplifier with a high stimulated Brillouin scattering threshold and high conversion efficiency. The fiber laser amplifier comprises a to-be-amplified laser port,a forward pump light port, a forward signal/pump coupler, a gain fiber, a second fiber bragg grating and an amplified laser exit port which are sequentially arranged on a laser amplification light path. When to-be-amplified laser of the fiber laser amplifier is amplified by the high-power fiber laser amplifier, the corresponding fiber bragg gratings are added to the two ends of the gain fiber, sothat pump light can be transmitted twice in the gain fiber, the use length of the gain fiber is shortened, the SBS total gain of the fiber laser amplifier is reduced, and the service life of the fiberlaser amplifier is prolonged. Therefore, the SBS threshold of the fiber laser amplifier is improved, and higher-power narrow-linewidth laser output is realized.

Description

technical field [0001] The invention relates to the technical field of increasing the stimulated Brillouin scattering threshold of a high-power fiber laser amplifier, in particular to a fiber laser amplifier with a high stimulated Brillouin scattering threshold and high conversion efficiency. Background technique [0002] With the development of science and technology and economic growth, in the field of industrial manufacturing, higher and higher requirements are placed on the output power and conversion efficiency of laser systems. However, in the case of high power, the fiber laser amplifier is limited by the stimulated Brillouin scattering effect (hereinafter referred to as SBS), and it is difficult to increase the output power. Moreover, in the case of high power, the low conversion efficiency of the laser will convert a large amount of pump light into waste heat, which greatly increases the heat dissipation cost. A variety of schemes have been proposed to suppress the...

Claims

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Application Information

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IPC IPC(8): H01S3/067H01S3/10H01S3/30
CPCH01S3/0675H01S3/06754H01S3/10023H01S3/302
Inventor 王天晗宋祥武春风李强姜永亮刘厚康戴玉芬雷敏杨雨廖明龙
Owner 武汉光谷航天三江激光产业技术研究院有限公司
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