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Fiber lasers having a complex-valued Vc-parameter for gain-guiding
Fiber lasers having a complex-valued Vc-parameter for gain-guiding
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机译:具有复数值Vc参数的光纤激光器用于增益引导
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摘要
The instant invention concerns optical fibers that have complex-valued Vc-parameters due to gain g established by active dopants that are doped into the fiber core in accordance with a doping profile. In particular, the doping levels are very high, such that the gain g makes a sufficiently large contribution to an imaginary part of the complex-valued Vc-parameter to define at least one gain-guided mode, e.g., the fundamental mode or several low-order modes of radiation in the optical fiber. The fiber does not require any index-guiding effects to a single mode or just a few of the lowest-order modes in large cross-section cores having diameters in the range from 50 &mgr;m to 500 &mgr;m in diameter and yield kilowatt level output power. The fiber may, in addition to gain-guiding, take advantage of a refractive index profile to provide for index-guiding or index-antiguiding effects in addition to gain-guiding.
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机译:本发明涉及具有归因于由根据掺杂分布被掺入到光纤芯中的活性掺杂剂建立的增益g的V值 c Sub>-参数的光纤。特别地,掺杂水平非常高,使得增益g对复数值V c Sub>参数的虚部做出足够大的贡献,以定义至少一个增益引导模式,例如,光纤的辐射的基本模式或几种低阶模式。在直径为50μm至500μm的大横截面纤芯中,光纤对单一模式或仅几个最低阶模式不需要任何折射率引导作用,并且产生的千瓦数电平输出功率。除了增益引导之外,光纤还可以利用折射率分布来提供增益引导之外的折射率引导或折射率抗引导效果。
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