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高功率光纤激光器的广泛应用前景使其成为固体激光器的研究新热点,但是由于受到受激布里渊散射(SBS)和受激拉曼散射(SRS)的影响,严重限制了单根光纤的最大输出功率,与此同时随着输出功率的增加带来了光束质量变差的问题。光纤激光并联组束的方法因其光束质量差,也在其应用上受到诸多限制,而基于倏逝波耦合的多路激光束相干叠加实现的相干组束技术则能使输出功率得以提高的同时保证好的光束质量。基于上述的问题,文中设计出解决方案并理论计算对比了一芯、三芯、七芯的光子晶体光纤光强分布情况,证明集成式多芯光子晶体光纤可以很好地实现相干组束输出,这为实现光纤激光器高功率和高光束质量输出提供新的可能途径。
The wide application of high power fiber lasers has made it a new hot spot in the research of solid-state lasers. However, due to the influence of stimulated Brillouin scattering (SBS) and stimulated Raman scattering (SRS), the maximum single fiber Output power, at the same time with the increase of the output power brings about the problem of the deterioration of the beam quality. Fiber laser parallel beam method because of its poor beam quality, but also in its application are subject to many restrictions, and based on evanescent wave coupling of the multi-channel laser beam coherent beam technique to achieve the coherent beam technology can make the output power can be improved at the same time Ensure good beam quality. Based on the above problems, the paper presents a solution and theoretically calculates the light intensity distribution of one-core, three-core and seven-core photonic crystal fiber, and proves that the integrated multi-core photonic crystal fiber can well achieve coherent beam output, This provides new possibilities for high power and high beam quality output of fiber lasers.