Kasztelanic Rafal, Nguyen Hue Thi, Pysz Dariusz, Thienpont Hugo, Omatsu Takashige, Buczynski Ryszard
Faculty of Physics, University of Warsaw, Pasteur 5, Warsaw, 02-093, Poland.
Lukasiewicz Research Network - Institute of Microelectronics and Photonics, Wolczynska 133, Warsaw, 01-919, Poland.
Adv Sci (Weinh). 2024 Sep;11(33):e2402886. doi: 10.1002/advs.202402886. Epub 2024 Jun 28.
The development of bend-induced effectively single-mode fiber with a square cross-section and flat top-hat intensity distribution is reported using core topology nanostructuring dedicated to femtosecond laser ablation systems. The fiber's core comprises 5419 silica and germanium-doped silica nanorods with a diameter of 430 nm each arranged into a hexagonal lattice. The distribution of the rods is calculated using in-house developed code based on the Monte Carlo algorithm to obtain a target shape of mode and intensity distribution. As a proof-of-concept, a silica nanostructured fiber with a 24 µm core is developed and verified against the purity of mode guidance, bending, and guiding losses. It is shown that for a wavelength of 1030 nm, the fiber is effectively single-mode with 96% mode purity when bending with a radius of 20 cm is applied. The fiber has a measured mode area of 360 µm, numerical aperture of 0.03, and total losses of 0.07 dB m.
报道了利用专用于飞秒激光烧蚀系统的纤芯拓扑纳米结构化技术，开发出具有方形横截面和平顶帽强度分布的弯曲诱导有效单模光纤。该光纤的纤芯由5419根二氧化硅和掺锗二氧化硅纳米棒组成，每根纳米棒的直径为430纳米，排列成六边形晶格。使用基于蒙特卡罗算法的内部开发代码计算纳米棒的分布，以获得模式和强度分布的目标形状。作为概念验证，开发了一种纤芯为24微米的二氧化硅纳米结构光纤，并针对模式引导纯度、弯曲和引导损耗进行了验证。结果表明，对于波长为1030纳米的情况，当施加半径为20厘米的弯曲时，该光纤具有96%的模式纯度，是有效单模的。该光纤的测量模式面积为360微米²，数值孔径为0.03，总损耗为0.07分贝/米。
