Suppression of multi-pulse formation in all-polarization-maintaining figure-9 erbium-doped fiber mode-locked laser
Jun-Kai Shi(石俊凯)1, Deng-Feng Dong(董登峰)1,2,†, Ying-Ling Pan(潘映伶)1, Guan-Nan Li(李冠楠)1, Yao Li(黎尧)1, Li-Tuo Liu(刘立拓)1, Xiao-Mei Chen(陈晓梅)1, and Wei-Hu Zhou(周维虎)1,2
1 Optoelectronic Technology R & D Center, Institute of Microelectronics, Chinese Academy of Sciences, Beijing 100029, China; 2 University of Chinese Academy of Sciences, Beijing 100049, China
Abstract We report on a novel architecture to suppress the multi-pulse formation in an all-polarization-maintaining figure-9 erbium-doped fiber laser under high pump power. A 2× 2 fiber coupler is introduced into the phase-biased nonlinear amplifying loop mirror to extract part of intracavity laser power as a laser output, and the dependence of output couple ratio of fiber coupler on the mode-locking state is experimentally investigated. The intracavity nonlinear effect is mitigated by lowering the intracavity laser power, which is conducive to avoiding the multi-pulse formation. In the meantime, the loss-imbalance induced by fiber coupler is helpful in improving the self-starting ability. With the proposed laser structure, the multiple pulse formation can be suppressed and high power single pulse train can be obtained. The laser emits three pulse trains which is convenient for some applications. Finally, the output power values of three ports are 5.3 mW, 51.3 mW, and 13.2 mW, respectively. The total single pulse output power is 69.8 mW, which is more than 10 times the result without OC2. The total slope efficiency is about 10.1%. The repetition rate of three pulse trains is 21.17 MHz, and the pulse widths are 2.8 ps, 2.63 ps, and 6.66 ps, respectively.
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 51905528), the Key Research Project of Bureau of Frontier Sciences and Education, Chinese Academy of Sciences (Grant No. QYZDY-SSW-JSC008), and the National Key Research and Development Project, China (Grant Nos. 2019YFB2005600 and 2018YFB2003403).
Altmetric calculates a score based on the online attention an article receives. Each coloured thread in the circle represents a different type of online attention. The number in the centre is the Altmetric score. Social media and mainstream news media are the main sources that calculate the score. Reference managers such as Mendeley are also tracked but do not contribute to the score. Older articles often score higher because they have had more time to get noticed. To account for this, Altmetric has included the context data for other articles of a similar age.