Author Affiliations
Abstract
College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China
We report a 2 kW all-fiberized Raman fiber amplifier with efficient brightness enhancement based on the graded-index fiber. The maximum power output reaches up to 2.034 kW centered at 1130 nm, with a conversion efficiency of 79.35% with respect to the injected pump power. To the best of our knowledge, this is the highest conversion efficiency obtained for any Raman laser system using graded-index fiber. An optimized fiber combiner adopting graded-index fiber as the pigtail fiber was fabricated, enabling the preservation of the seeding brightness in the core-pumped Raman fiber amplifier, and further enhancing the ultimate brightness of the output laser after amplification. At the maximum power output, the beam quality parameter M2 is 2.8, corresponding to a signal-to-pump brightness enhancement factor of 11.2. As far as we know, we obtain the highest brightness enhancement among Raman fiber lasers of over 100 W, and the best beam quality for graded-index Raman fiber lasers of over 150 W.
nonlinear optics optical fiber lasers power amplifiers Raman scattering High Power Laser Science and Engineering
2020, 8(4): 04000e33
1 北京交通大学全光网络与现代通信网教育部重点实验室, 北京 100044
2 北京交通大学光波技术研究所, 北京 100044
光纤激光传感系统作为一种新型的光纤传感技术，结合了光纤传感的高灵敏度、可分布式测量和不易受电磁干扰等优点，以及光纤激光器的窄线宽和高光信噪比等优势，能够很好地应用于油田、矿山、桥梁、电力以及飞机等领域的测量和安全监控。从两个方面介绍了目前光纤激光传感系统的研究进展，一方面是基于单参量测量的光纤激光传感系统，系统所探测的参量包含了温度、应变、折射率、电流、声波和风速等；另一方面是基于双参量测量的光纤激光传感系统，主要是解决温度与横向应力、应变和折射率等交叉敏感的问题。
传感器 光纤传感 光纤激光器 单参量测量 双参量测量
1 空军工程大学电讯工程学院,西安,710077
2 中国科学院西安光学精密机械研究所,瞬态光学与光子技术国家重点实验室,西安,710068
给出了单模输出的铒镱共掺双包层光纤激光器(EY-DCFL)的数值分析及最新实验结果.基于速率方程及功率传输方程,对单模EY-DCFL进行数值分析,从理论上对其性能进行优化.然后,在相同条件下进行了EY-DCFL的实验研究.描述了输出激光功率随入纤泵浦功率和光纤长度的变化以及输出激光波长随光纤长度的变化.在光纤长度为6.3 m时,获得了波长为1566 nm、最大功率为2.2 W 的单模激光输出,整体光-光转换效率22%,这是目前国内用该类光纤获得的最高单模输出功率.
光纤激光器 双包层光纤 铒镱共掺 包层泵浦 数值模拟 Optical fiber lasers Double-cladding fiber Erbium-Ytterbium co-doped Cladding pump Numerical simulation
1 Institute for Infocomm Research, Innovation Center Bock 2, 18 Nanyang Drive, Singapore 637723
2 Network Technology Research Center, School of Electrical & Electronic Engineering, Nangyang Technological University, Singapore 639798
3 Department of Electrical Engineering, The Hong Kong Polytechnic University, Hung Horn, Kowloop Hong Kong
