Cao Yafei, Jia Dongfang, Liu Tonghui, Yang Tianxin, Wang Zhaoying, Ge Chunfeng
Appl Opt. 2017 Aug 20;56(24):6742-6747. doi: 10.1364/AO.56.006742.
We have experimentally demonstrated a square pulse in a passively mode-locked Yb-doped fiber ring laser operating in the dissipative soliton resonance (DSR) region based on the nonlinear polarization rotation technique. In our experiment, a 1.5-km long single-mode fiber (SMF) is inserted into the cavity to increase the cavity length. The total cavity is 1501.8 m. With increasing pump power, the pulse duration can be tuned from 209.8 ns to 812.4 ns without wave-breaking, and the maximum output single pulse energy is 42.34 nJ. To the best of our knowledge, this is the widest pulse in any Yb-doped mode-locked fiber laser. Moreover, the relationship between pulse width and cavity length is investigated. When the total cavity length is decreased to 1001.8 m and 501.8 m, the tuning range of square pulse is 372.4 ns (from 58.6 ns to 431 ns) and 138 ns (from 26 ns to 164 ns), respectively, and the maximum output single pulse energy is 13.85 nJ and 8.75 nJ, respectively.
我们通过实验在基于非线性偏振旋转技术、工作在耗散孤子共振（DSR）区域的被动锁模掺镱光纤环形激光器中演示了一个方脉冲。在我们的实验中，将一根1.5千米长的单模光纤（SMF）插入腔内以增加腔长。总腔长为1501.8米。随着泵浦功率的增加，脉冲持续时间可在不出现波形破裂的情况下从209.8纳秒调谐至812.4纳秒，最大输出单脉冲能量为42.34纳焦。据我们所知，这是任何掺镱锁模光纤激光器中最宽的脉冲。此外，还研究了脉冲宽度与腔长之间的关系。当总腔长减小到1001.8米和501.8米时，方脉冲的调谐范围分别为372.4纳秒（从58.6纳秒到431纳秒）和138纳秒（从26纳秒到164纳秒），最大输出单脉冲能量分别为13.85纳焦和8.75纳焦。
