Yu Hao, Zheng Xin, Yin Ke, Cheng Xiang'ai, Jiang Tian
Appl Opt. 2015 Dec 1;54(34):10290-4. doi: 10.1364/AO.54.010290.
By coupling black phosphorus (BP) nanoplatelets (NPs) with a fiber-taper evanescent light field, a saturable absorber (SA) based on the BP NPs has been successfully fabricated and used in a thulium/holmium-doped fiber laser as the mode locker. The SA had a modulation depth of ∼9.8% measured at 1.93 μm. A stable mode-locking operation at 1898 nm was achieved with a pulse width of 1.58 ps and a fundamental mode-lock repetition rate of 19.2 MHz. By increasing the pump intensity, phenomena of multi-pulsing operations, including harmonic mode-locked states and soliton bunches, were obtained in the experiment, showing that the BP NPs possess an ultrafast optical response time. This work suggests that the BP NPs-based SA is potentially useful for ultrashort, pulsed laser operations in the eye-safe region of 2 μm.
通过将黑磷（BP）纳米片（NPs）与光纤锥消逝光场耦合，成功制备了基于BP NPs的可饱和吸收体（SA），并将其用作掺铥/钬光纤激光器中的锁模器。该SA在1.93μm处测得的调制深度约为9.8%。在1898nm处实现了稳定的锁模运转，脉冲宽度为1.58ps，基模锁模重复频率为19.2MHz。通过提高泵浦强度，实验中获得了多脉冲运转现象，包括谐波锁模状态和孤子群，这表明BP NPs具有超快的光学响应时间。这项工作表明，基于BP NPs的SA在2μm的人眼安全区域的超短脉冲激光运转中具有潜在的应用价值。
