Abstract
In this paper, we proposed the diameter-selected single-walled carbon nanotubes (SWCNTs) via the simple liquid phase separation for the pulsed 2 μm laser operation as the saturable absorber (SA). The nonlinear absorption properties of the prepared SWCNTs based SA at 2 μm were investigated. The modulation depth and the saturation intensity were 8% and 6.5 kW/cm2, respectively. By employing the diameter-specified SWCNTs SA, a stable passively Q-switched Tm:YLF laser was demonstrated at 2 μm for the first time. The maximum repetition rate of 35.9 kHz and the shortest pulse duration of 920 ns were achieved with the output coupler of T = 3%. The experiment results indicated that the diameter selection of SWCNTs could be a promising method to improve the Q-switching characteristics.
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