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Mode coupling and output beam quality of 100-400 (mu)m core silica fibers

机译:100-400μm芯石英光纤的模耦合和输出光束质量

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摘要

Propagation and mode coupling within relatively short (approx1-10 m) large core, nominally multimode, fibers are of interest in a number of applications. In this research, we have studied the output beam quality and mode coupling in various fibers with core diameters of 100-400 (mu)m and lengths of 2 m. Output beam quality (M~(2)) and mode-coupling coefficients (D) have been studied for different clad dimensions, numerical apertures, and wavelengths. The mode-coupling coefficients have been determined based on modal power diffusion considerations. The results show that D scales approximately as the inverse square of the clad dimension and inverse square root of the wavelength. Output from a 2 m length fiber of 100 (mu)m core and 660 (mu)m clad fiber is close to single mode (M~(2) velence 1.6), while output from a 200 (mu)m core and 745 (mu)m clad fiber also has high beam quality.
机译:在相对短的(大约1-10 m)大纤芯,名义上为多模的光纤中的传播和模耦合在许多应用中都令人关注。在这项研究中,我们研究了芯直径为100-400μm,长度为2 m的各种光纤的输出光束质量和模式耦合。对于不同的包层尺寸,数值孔径和波长,已经研究了输出光束质量(M〜(2))和模式耦合系数(D)。已基于模态功率扩散考虑因素确定了模态耦合系数。结果表明,D的大小近似等于包层尺寸的平方和波长的平方根。 2 m长的100μm纤芯和660μm包层光纤的输出接近单模(M〜(2)velence 1.6),而200μm纤芯和745(微米包层光纤也具有高光束质量。

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