Bullington Amber L, Pax Paul H, Sridharan Arun K, Heebner John E, Messerly Michael J, Dawson Jay W
Lawrence Livermore National Laboratory, L-592, P.O. Box 808, Livermore, California 94551, USA.
Appl Opt. 2012 Jan 1;51(1):84-8. doi: 10.1364/AO.51.000084.
Mode conversion from the fundamental to a higher-order mode in a rectangular-core optical fiber is accomplished by applying pressure with the edge of a flat plate. Modal analysis of the near and far field images of the fiber's transmitted beam determines the purity of the converted mode. Mode conversion reaching 75% of the targeted higher-order mode is achieved using this technique. Conversion from a higher-order mode back to the fundamental mode is also demonstrated with comparable efficiency. Propagation of a higher-order mode in a rectangular-core fiber allows for better thermal management and bend-loss immunity than conventional circular-core fibers, extending the power-handling capabilities of optical fibers.
通过用平板边缘施加压力，可在矩形纤芯光纤中实现从基模到高阶模的模式转换。对光纤传输光束的近场和远场图像进行模态分析，可确定转换模式的纯度。使用该技术可实现高达目标高阶模75%的模式转换。还展示了以相当的效率从高阶模转换回基模。与传统圆形纤芯光纤相比，矩形纤芯光纤中高阶模的传播具有更好的热管理和抗弯曲损耗能力，扩展了光纤的功率处理能力。
