Novel technique for fabrication of large core, high rare earth concentration, photodarkening resistant fibres for high power fibre laser applications

用于高功率光纤激光器应用的大纤芯、高稀土浓度、抗光暗化光纤的新技术制造

• 批准号: EP/E033725/1
• 负责人: David Richardson
• 金额: $ 47.87万
• 依托单位: University of Southampton
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2007
• 资助国家: 英国
• 起止时间: 2007 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FE033725%2F1
• 关键词: Novel; technique; fabrication; large; core

Research into high power fibre lasers is being driven by material processing and military applications and over recent years there has been much interest in scaling output powers from cladding pumped fibre lasers and amplifiers. While kW power levels with diffraction limited output have been demonstrated from a single core fibre the drive is now towards multi kW powers with high beam quality. To achieve this it is important to maximize both the core area and the rare earth doping concentration whilst maintaining robust single mode operation and good optical to optical conversion efficiency. These features are also needed in order to avoid the need for excessively long fibres for efficient pump absorption, and to raise the threshold for unwanted nonlinear processes and optical damage. The proposed research programme will develop a novel process for incorporating rare earth and aluminium dopants into fibre performs in a simple and cost effective way. The technique will allow higher concentrations of dopants with increased uniformity along the length of the preform, increased core size, reduced background loss, and no phodarkening in fibres. The use of lanthanide chelates to incorporate rare earths in preforms has been demonstrated previously. However, the previously reported techniques require complicated, bulky and expensive heated bubblers and gas lines. The proposed technique would simplify things greatly by placing the chelates in independently heated crucibles within the glassware on the lathe, in close proximity to the deposition zone thereby increasing control and versatility.It is also important that these dopants can be incorporated into large volumes of glass to create large core structures and to obtain better fibre yields, whilst also reducing the number of steps required to make multiple core fibre for high power fibre lasers and to facilitate the production of the doped capillaries required for various classes of microstructures fibre including: holey fibres, hollow core fibre, band gap fibres and ribbon fibres incorporating multiple doped core arrays.

高功率光纤激光器的研究是由材料加工和军事应用驱动的，近年来，人们对包层泵浦光纤激光器和放大器的输出功率缩放很感兴趣。虽然已经从单芯光纤中证明了具有衍射限制输出的kW功率水平，但驱动器现在正朝着具有高光束质量的多kW功率方向发展。为了实现这一目标，在保持稳定的单模操作和良好的光到光转换效率的同时，最大限度地提高核心面积和稀土掺杂浓度是很重要的。为了避免需要过长的光纤来实现有效的泵浦吸收，并提高不必要的非线性过程和光学损伤的阈值，也需要这些特征。拟议的研究计划将开发一种新工艺，以一种简单而经济有效的方式将稀土和铝掺杂剂掺入纤维中。该技术将允许更高浓度的掺杂剂，增加预制体长度的均匀性，增加芯尺寸，减少背景损耗，并且纤维中没有暗化。镧系螯合物在预铸体中加入稀土元素的使用已经得到证实。然而，先前报道的技术需要复杂、笨重和昂贵的加热起泡器和气体管道。所提出的技术将大大简化的事情，通过放置在独立加热坩埚内的玻璃器皿在车床上，在靠近沉积区，从而增加控制和多功能性。同样重要的是，这些掺杂剂可以加入到大量的玻璃中，以创建大芯结构并获得更好的纤维产量，同时也减少了为高功率光纤激光器制造多芯纤维所需的步骤，并促进了各种微结构纤维所需的掺杂毛细血管的生产，包括：多孔纤维，空心芯纤维，带隙纤维和包含多掺杂芯阵列的带状纤维。

项目成果

Fiber design for high-power fiber lasers

• DOI: 10.1117/12.809210
• 发表时间: 2009-02
• 作者: J. Sahu;S. Yoo;A. Boyland;A. Webb;M. Kalita;J. Maran;Y. Jeong;J. Nilsson;W. Clarkson;D. Payne

Rare-earth doped optical fiber fabrication using novel gas phase deposition technique

使用新型气相沉积技术制造稀土掺杂光纤

• DOI: 10.1364/cleo.2010.cthv7
• 发表时间: 2010
• 期刊: CLEO/QELS: 2010 Laser Science to Photonic Applications
• 作者: A. Boyland;A. Webb;M. Kalita;S. Yoo;C. Codemard;R. Standish;J. Nilsson;J. Sahu
• 通讯作者: J. Sahu

Specialty Doped Fibers in High Power Lasers (invited)

高功率激光器中的特种掺杂光纤（特邀）

• 作者: Jayanta Sahu (Author)

Novel fiber fabrication methods benefit fiber lasers

新型光纤制造方法有利于光纤激光器

• 作者: Jayanta Sahu (Author)

Pump Power Depreciation by Photodarkening in Ytterbium-Doped Fibers and Amplifiers

• DOI: 10.1109/lpt.2013.2289965
• 发表时间: 2014
• 期刊: IEEE Photonics Technology Letters
• 影响因子: 2.6
• 作者: Nanxi Li;S. Yoo;Xia Yu;D. Jain;J. Sahu