基于石墨烯量子点与二硫化钼的双被动调Q激光器研究

Research on Double Passively Q-Switched Laser Based on Graphene Quantum Dots and Molybdenum Disulfide

为获得脉冲宽度窄、波形对称性好、输出性能稳定的脉冲激光,设计了一种基于石墨烯量子点与二硫化钼的1064 nm双被动调Q激光器。该激光器采用结构简单的线形腔结构,以808 nm LD为抽运源、Nd∶YVO4为增益介质。分别采用水热法和锂离子-插层法获得了石墨烯量子点溶液与二硫化钼溶液。经旋涂、烘干等工艺制备出可饱和吸收体,作为被动调Q器件。相比于单被动调Q激光器,双被动调Q激光器输出的激光脉冲宽度更窄、脉冲波形对称性更好。当抽运功率为12.9 W时,实验测到的调Q激光脉冲宽度为180 ns,重复频率为1085 kHz,信噪比为44 dB,平均输出功率为595 mW。

In order to obtain pulse lasers with narrow pulse width,good waveform symmetry,and stable output performance,a 1064 nm double passively Q-switched laser based on graphene quantum dots and molybdenum disulfide was designed.The laser used a simple linear cavity structure,with 808 nm LD as the pump source and Nd∶YVO4 as the gain medium.Graphene quantum dots and molybdenum disulfide were obtained by hydrothermal method and lithium-ion intercalation method respectively.Saturable absorbers were prepared through spin coating and drying process,which were used as passively Q-switched devices.Compared with the single passively Q-switched laser,the output pulse width of the double passively Q-switched laser was narrower and the pulse waveform symmetry was better.When the pump power was 12.9 W,the pulse width of Q-switched laser was 180 ns,the repetition rate was 1085 kHz,the signal-to-noise ratio was 44 dB,and the average output power was 595 mW.