Cheng Peiyun, Du Yueqing, Han Mengmeng, Shu Xuewen
Opt Express. 2020 Apr 27;28(9):13177-13186. doi: 10.1364/OE.391006.
We demonstrated an ultrafast erbium-doped fiber laser (EDFL) based on ferroferric-oxide (FeO) nanoparticles as a saturable absorber (SA). The investigated SA was based on magnetic fluid deposited on the end face of a fiber ferrule connector. When the SA was inserted into an EDFL cavity, a stable 2.93 ps mode-locked pulse can be achieved by adjusting the intra-cavity polarization controller. The pulse had a central wavelength of 1572.39 nm and a 3 dB bandwidth of 1.39 nm. We also obtained Q-switched mode-locked pulses at 1593.4 nm. The repetition frequency and the temporal width of the Q-switched pulse envelope varied with the pump power. When the pump power reached 225 mW, the maximum average output power and the pulse envelope energy were up to 4.51 mW and 235.5 nJ. To the best of our knowledge, this is the first time that mode-locked and Q-switched mode-locked pulses have been obtained in a fiber laser based on FeO nanoparticles.
我们展示了一种基于三氧化二铁（FeO）纳米颗粒作为可饱和吸收体（SA）的超快掺铒光纤激光器（EDFL）。所研究的可饱和吸收体基于沉积在光纤插芯连接器端面上的磁流体。当将该可饱和吸收体插入掺铒光纤激光器腔中时，通过调整腔内偏振控制器可实现稳定的2.93皮秒锁模脉冲。该脉冲的中心波长为1572.39纳米，3分贝带宽为1.39纳米。我们还在1593.4纳米处获得了调Q锁模脉冲。调Q脉冲包络的重复频率和时间宽度随泵浦功率而变化。当泵浦功率达到225毫瓦时，最大平均输出功率和脉冲包络能量分别高达4.51毫瓦和235.5纳焦。据我们所知，这是首次在基于FeO纳米颗粒的光纤激光器中获得锁模和调Q锁模脉冲。
