Wang Whenhao, Tian Meng, Yang Yan, Huang Yanhua, Li Cong, Chen Guoliang, Lv Min
Appl Opt. 2020 Apr 10;59(11):3440-3446. doi: 10.1364/AO.388878.
A tunable mode-locked erbium-doped fiber laser with a digital micro-mirror device (DMD) as the wavelength tuner and nonlinear amplifying loop mirror as the mode-locked device is proposed and experimentally demonstrated. The mode-locked pulse with the center wavelength of 1538-1565 nm continuously tunable is achieved. The average power of the output pulse is 1.028 mW, the pulse repetition frequency is 1.7 MHz, the pulse duration is 616 fs, and the single pulse energy is 0.6 nJ. By controlling the DMD, the center wavelength can be fine-tuned with the tuning accuracy of 0.07 nm. With the increase of the pump power, the traditional soliton pulse is transformed into a noise-like pulse (NLP), and the power of the NLP can reach 34 mW. This mode-locked process can work for a long time and is almost unaffected by the external environment. These results are very useful for applications where pulsed lasers with different wavelengths are needed.
提出并通过实验证明了一种以数字微镜器件（DMD）作为波长调谐器、非线性放大环形镜作为锁模器件的可调谐锁模掺铒光纤激光器。实现了中心波长在1538 - 1565 nm范围内连续可调的锁模脉冲。输出脉冲的平均功率为1.028 mW，脉冲重复频率为1.7 MHz，脉冲持续时间为616 fs，单脉冲能量为0.6 nJ。通过控制DMD，中心波长可实现0.07 nm的微调精度。随着泵浦功率的增加，传统孤子脉冲转变为类噪声脉冲（NLP），且NLP的功率可达34 mW。这种锁模过程可长时间工作，几乎不受外部环境影响。这些结果对于需要不同波长脉冲激光器的应用非常有用。
