Todorov Filip, Aubrecht Jan, Peterka Pavel, Schreiber Ondřej, Jasim Ali A, Mrázek Jan, Podrazký Ondřej, Kamrádek Michal, Kanagaraj Nithyanandan, Grábner Martin, Baravets Yauhen, Cajzl Jakub, Koška Pavel, Fišar Adam, Kašík Ivan, Honzátko Pavel
Institute of Photonics and Electronics of the Czech Academy of Sciences, Chaberská 57, 182 51 Prague, Czech Republic.
Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Břehová 7, 115 19 Prague, Czech Republic.
Materials (Basel). 2020 Nov 17;13(22):5177. doi: 10.3390/ma13225177.
Laser sources emitting in the infrared range at around 2 µm are attracting great interest for a variety of applications like processing of transparent thermoplastic polymers in industry as well as plenty of applications in medicine, spectroscopy, gas sensing, nonlinear frequency conversion to the mid-infrared, to mention a few. Of late, fiber lasers compared to other kinds of lasers benefit from their all-fiber design, leading to a compact, robust, and well thermally manageable device. Particularly, thulium- and holmium-doped fiber lasers are the first choice in fiber lasers emitting light around 2 µm. In this paper, we give an overview of our recent results in the research on thulium- and holmium-doped optical fibers, fiber lasers, and related research topics in the 2-µm spectral range. In particular, we present, to our knowledge, the first results of improvement of pump absorption in double-clad fibers thanks to the fiber twist frozen during drawing. Finally, a brief demonstration of material processing by thulium all-fiber laser operating at 2 µm is presented.
发射波长在2μm左右红外波段的激光源，因其在工业上可用于加工透明热塑性聚合物以及在医学、光谱学、气体传感、非线性频率转换至中红外等众多应用领域而备受关注。近年来，与其他类型的激光器相比，光纤激光器得益于其全光纤设计，从而形成了一种紧凑、坚固且热管理良好的器件。特别是，掺铥和掺钬光纤激光器是发射波长在2μm左右的光纤激光器的首选。在本文中，我们概述了我们在掺铥和掺钬光纤、光纤激光器以及2μm光谱范围内相关研究课题的最新研究成果。特别是，据我们所知，我们首次展示了由于在拉丝过程中冻结的光纤扭曲而提高了双包层光纤中泵浦吸收的结果。最后，简要展示了工作波长为2μm的掺铥全光纤激光器在材料加工方面的应用。
