TiCN作为可饱和吸收体的2.8μm被动调Q锁模光纤激光器

2.8μm passively Q-switched mode-locked fiber laser using TiCN as saturable absorber

本文报道了一种基于材料可饱和吸收的2.8μm被动调Q锁模掺铒氟化物光纤激光器。通过将TiCN颗粒作为可饱和吸收体直接涂覆于反射腔镜,并结合氟化物光纤垂直端面的输出耦合,实现了具有较低激光阈值和紧凑腔结构的2.8μm脉冲光纤激光器。该激光器在泵浦功率达到330 mW时,开始出现调Q锁模脉冲。随着泵浦功率持续增大,调Q脉冲包络重复频率从14.34 kHz增加至32.57 kHz,对应的脉冲宽度从10.51μs减小至5.40μs。在650 mW的泵浦功率下,获得最大平均输出功率25.83 mW,斜率效率为7.2%。

A 2.8μm passively Q-switched mode-locked erbium-doped fluoride fiber laser based on material saturable absorption is reported in this paper.By depositing TiCN particles directly onto the cavity mirror as the saturable absorber and using the vertical cleaved end of the fluoride fiber as an output coupler,the 2.8μm pulsed fiber lasing with a low laser threshold and a compact cavity structure is realized.When the pump power reaches 330 mW,the Q-switched mode-locked pulses begin to appear.With the increase of pump power,the repetition frequency of Q-switched pulse envelope increases from 14.34 to 32.57 kHz,and the pulse width decreases from 10.51 to 5.40μs.Under the pump power of 650 mW,the maximum average output power of 25.83 mW is obtained,and the slope efficiency is about 7.2%.