多芯光子晶体光纤的相干组束集成

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。

Coherent beam combination of integrated photonic crystal fiber

The wide application of high power fiber laser makes it become a new hotspot in the research of solid state laser. But due to stimulated Raman scattering(SRS) and stimulated Brillouin scattering(SBS) effect, the maximum output power of single fiber is limited, and beam quality becomes worse with the increase of power variation. Method of parallel beam combining of fiber laser because of its poor beams, so that its application is restricted, and coherent beam combination technology can make multiple laser beam coherent superposition, so that the output power can be improved while ensuring good beam quality. In this paper, the design and theoretical calculation of one core, three core, seven core photonic crystal fiber light distribution were conducted, proving that integrated photonic crystal fiber can be very good to achieve coherent beam output, while achieving a high output power and high beam quality of fiber laser.