Han Xu, Feng Guo-Ying, Han Jing-Hua, Wu Chuan-Long, Zhou Shou-Huan
College of Electronics and Information Engineering, Sichuan University, Chengdu 610065, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2012 Nov;32(11):3040-3.
The present paper reports a double pass forward superfluorescent fiber source (SFS), which uses a length of large mode area double cladding ytterbium doped fiber as gain medium. The maximum output power of this SFS is 341 mW. With the output power between 201 and 341 mW, the 3dB bandwidth of this SFS was more than 80 nm. This is the widest 3 dB bandwidth obtained from ytterbium doped SFS. The output power of the SFS linearly increased with the increment of the pump source injected current. It's output power is not very high, but under normal circumstances, it could meet the needs of the SFS. From the energy level structure of ytterbium ions and the absorption cross-section/emission cross section of ytterbium ions in quartz substrate, the physical mechanisms responsible for superfluorescence were analyzed. This double-cladding ytterbium-doped superfluorescent fiber laser benefits from the superfluorescence radiation near 1 025 and 1 075 nm, so the superfluorescence with 3 dB bandwidth reaching up to 80 nm could be obtained.
本文报道了一种双程前向超荧光光纤源（SFS），它使用一段大模面积双包层掺镱光纤作为增益介质。该SFS的最大输出功率为341 mW。当输出功率在201至341 mW之间时，该SFS的3 dB带宽超过80 nm。这是从掺镱SFS获得的最宽的3 dB带宽。SFS的输出功率随泵浦源注入电流的增加而线性增加。其输出功率不是很高，但在正常情况下，它可以满足SFS的需求。从镱离子的能级结构以及石英衬底中镱离子的吸收截面/发射截面出发，分析了产生超荧光的物理机制。这种双包层掺镱超荧光光纤激光器受益于1025和1075 nm附近的超荧光辐射，因此可以获得3 dB带宽高达80 nm的超荧光。
