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MOPA-structured fiber lasers capable of suppressing the SBS effect

A fiber laser and effect technology, which is applied in the direction of lasers, laser components, and the structure/shape of active media, can solve the problems of insignificant suppression effect, no experimental reports and engineering applications, and complex structure of specially designed optical fibers, etc., to achieve The effect of suppressing the SBS effect

Active Publication Date: 2018-01-23
NORTHWEST INST OF NUCLEAR TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] These methods have their own advantages and disadvantages, such as increasing the fiber radius, which is simple and easy to operate, but in order to ensure the beam quality of the laser, the radius increase is limited, and the suppression effect is not significant; the specially designed fiber structure is complex, and the design and production process It is quite difficult, so many designs and concepts only stay at the level of theoretical analysis, and there are no experimental reports and engineering applications
In practice, it is often necessary to combine multiple methods to work together to form a certain limit on the SBS effect of the amplifier.

Method used

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  • MOPA-structured fiber lasers capable of suppressing the SBS effect
  • MOPA-structured fiber lasers capable of suppressing the SBS effect
  • MOPA-structured fiber lasers capable of suppressing the SBS effect

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Embodiment Construction

[0029] figure 1 It is a traditional MOPA structure fiber laser, including seed light 1, pre-amplification stage 2 and several multi-stage amplification systems 6, 7 connected in series, the multi-stage amplification system includes pumping source 3, coupling device 9 and gain fiber 5, wherein the coupling The device 9 is arranged at the front end, the rear end or the front and rear ends of the gain fiber 5, and can be a fiber combiner, a V-groove or an embedded micro-mirror, and couples the light of the pump source 3 into the gain fiber 5 with high efficiency. When a fiber combiner is used, it usually adopts a multi-core structure, such as 6+1 cores or 18+1 cores, in which the middle core is used for signal light transmission, and the remaining cores are used to connect to the pump source 3 . exist figure 1 It can be seen from the figure that the traditional pump coupling device is set at a certain point in the front or rear space of the gain fiber 5, so that the laser power ...

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Abstract

The invention discloses a SBS effect suppressing device in the amplifier stage of a high-power narrow-linewidth fiber laser with MOPA structure, including a pump source, a coupling device and a gain fiber, and the pump source is coupled into the gain fiber through coupling devices at different positions of the gain fiber , that is, spatial multipoint pumping. Changes in the number and spatial distribution of pump sources will affect the spatial distribution of the number of inversion particles in the gain medium, which will further affect the amplification process of the signal light and SBS scattered light of the amplifier. By rationally designing the position and power of the pumping point, the efficiency of the amplifier can be guaranteed. At the same time, the amplification of SBS scattered light is weakened, the SBS effect of the amplifier is effectively suppressed, and the output power of the narrow linewidth fiber laser is increased.

Description

technical field [0001] The invention relates to a device for suppressing the SBS effect of an amplifier stage of an MOPA structure narrow-linewidth fiber laser, in particular to a device for suppressing the SBS effect of a high-power fiber amplifier by using space multi-point pumping. Background technique [0002] Fiber lasers have the advantages of high electro-optical efficiency and good beam quality. In recent years, they have been developed rapidly, and various indicators such as output power have repeatedly hit new highs, and their application range has continued to expand. Among them, narrow linewidth lasers have important application prospects in the fields of lidar, frequency conversion and coherent synthesis. The all-fiber laser based on the main oscillator power amplification (MOPA) structure has a compact structure and stable operation, and is an effective solution for the development of narrow-linewidth fiber lasers to high power. However, due to the stimulated ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/067H01S3/102H01S3/0941H01S3/094
Inventor 赵海川叶锡生陶蒙蒙王振宝陈绍武朱永祥闫燕吴勇王平冯刚杨鹏翎冯国斌
Owner NORTHWEST INST OF NUCLEAR TECH
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