Wei Chen, Chi Hao, Jiang Shurong, Zheng Le, Zhang Han, Liu Yong
Opt Express. 2020 Oct 26;28(22):33758-33766. doi: 10.1364/OE.410110.
In this paper, we fabricate the bulk-like multilayer platinum diselenide (PtSe) and employ it as saturable absorber (SA) for a passively Q-switched fiber laser operating at 2865 nm for the first time, to the best of our knowledge. The nonlinear optical measurements of the bulk-like multilayer PtSe reveal efficient saturable absorption property at around 3 µm showing a modulation depth of 8.54% and a saturation intensity of 0.074 GW/cm. By introducing the bulk-like PtSe-SA into the Ho/Pr co-doped ZBLAN fiber laser, stable Q-switched pulses with a duration as short as 620 ns are achieved at the pulse repetition rate of 238.1 kHz. The maximum average power is 93 mW, corresponding to a peak power of 0.63 W. The excellent long-term stability of the PtSe-SA was also verified utilizing the same experimental setup after 40 days of ambient storage of the PtSe sample. The results not only validate the excellent nonlinear optical performance of PtSe, but also indicate that the bulk-like PtSe is a promising long-term stable SA material under ambient conditions for nanosecond pulse generation in the 3-µm mid-infrared spectral region.
据我们所知，在本文中，我们首次制备了块状多层二硒化铂（PtSe₂），并将其用作可饱和吸收体（SA），用于被动调Q光纤激光器，该激光器工作波长为2865 nm。对块状多层PtSe₂的非线性光学测量表明，在3 µm左右具有高效的可饱和吸收特性，调制深度为8.54%，饱和强度为0.074 GW/cm²。通过将块状PtSe₂ - SA引入Ho/Pr共掺杂的ZBLAN光纤激光器中，在238.1 kHz的脉冲重复频率下实现了持续时间短至620 ns的稳定调Q脉冲。最大平均功率为93 mW，对应峰值功率为0.63 W。在PtSe₂样品在环境中储存40天后，使用相同的实验装置也验证了PtSe₂ - SA优异的长期稳定性。这些结果不仅验证了PtSe₂优异的非线性光学性能，还表明块状PtSe₂是一种在环境条件下有前景的长期稳定的可饱和吸收体材料，可用于3 µm中红外光谱区域的纳秒脉冲产生。
