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Stimulated Raman scattering suppression method for high power fiber laser amplifier system

A technology of stimulated Raman scattering and optical fiber amplifier, which is applied in the direction of laser scattering effect, laser, laser components, etc. It can solve the problems of long-period grating cross-sensitivity affecting stability, output spectral characteristic deterioration, and beam quality. , to achieve the effect of raising the Raman threshold, low insertion loss, and convenient preparation

Inactive Publication Date: 2019-01-11
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

Someone proposed a Raman-compatible method, that is, injecting a forward Raman seed light, allowing the forward Raman laser to output together with the signal laser, which can effectively suppress the backward Raman signal within a certain range, but the output spectrum The characteristics become worse, and the beam quality will also be affected to a certain extent
Another report uses long-period fiber gratings made of carbon dioxide lasers as filters to achieve the purpose of suppression by coupling part of Raman scattered light into the cladding, but the cross-sensitivity of long-period gratings affects its stability. Key factor

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  • Stimulated Raman scattering suppression method for high power fiber laser amplifier system
  • Stimulated Raman scattering suppression method for high power fiber laser amplifier system
  • Stimulated Raman scattering suppression method for high power fiber laser amplifier system

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Embodiment Construction

[0029] Embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0030] figure 1 It is a structural schematic diagram of Embodiment 1 of the present invention. The high-power fiber laser amplifier system includes a seed source and a fiber amplifier, and a chirped tilted fiber grating 6 is connected between the seed source and the fiber amplifier.

[0031] The seed source includes a pump LD light source 1, a pump beam combiner 2, a high reflection grating 3, a doped fiber 4, and a low reflection grating 5. There are multiple pump LD light sources, and the output pigtails of each pump LD light source are connected to Each pump arm of the pump combiner 2. figure 1 The diagrams shown in are all schematic diagrams, and the parameters, selected wavelengths, and output power of the pump LD light source vary according to the actual situation, and there are no special requirements. The output pigtail of the pump b...

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Abstract

A method for suppress stimulated Raman scatter of a high-power fiber laser amplify system includes adding a chirped tilted fiber grating to that high-power fiber laser amplifier system to suppress thestimulated Raman scattering. The high power fiber laser amplifier system includes a seed source and a fiber amplifier. The chirped tilted fiber Bragg grating is connected between the seed source andthe fiber amplifier. The chirped tilted fiber grating is directly connected between the seed source and the fiber amplifier, and the seed source is filtered by using the high loss of the chirped tilted fiber grating in the Raman band, so that the seed source can still output pure signal light at a higher power level. And improve the efficiency of the optical fiber amplifier, improve the overall system Raman threshold.

Description

technical field [0001] The invention belongs to the technical field of fiber lasers, in particular to a method for suppressing stimulated Raman scattering. Background technique [0002] Fiber lasers have the advantages of high efficiency, good beam quality, small size, maintenance-free, low operating cost, high beam quality, long operating life, easy modulation, compact structure, etc., and are widely used in military, industrial and other fields. With the improvement of LD brightness and the advent of double-clad fibers, the output power of fiber lasers has been greatly increased. However, stimulated Raman scattering (SRS) is a key factor that limits the further increase of fiber laser power. The Raman scattered light generated by the SRS effect in the fiber laser is bidirectionally transmitted. On the one hand, the forward transmitted Raman scattered light will compete with the signal light, resulting in a decrease in signal light power and affecting the normal operation ...

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Application Information

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IPC IPC(8): H01S3/30H01S3/067H01S3/0941
CPCH01S3/302H01S3/0675H01S3/06754H01S3/0941
Inventor 王泽锋王蒙王鹏睿胡琪浩李昊奚小明陈子伦王小林许晓军陈金宝
Owner NAT UNIV OF DEFENSE TECH
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